Inorganic Chemistry Practice Booklet PDF - JEE Main Past Papers 2020-2022

JEE MAIN INORGANIC CHEMISTRY PYQ 2020-21-22 Table of Contents S.No. Chapter Name Pg. No. 1. Periodic Table 01-06 2. Chemical Bonding 06-13 3. Coordination Compound 13-20 4. Metallurgy 21-27 5. Hydroge...

JEE MAIN INORGANIC CHEMISTRY PYQ 2020-21-22 Table of Contents S.No. Chapter Name Pg. No. 1. Periodic Table 01-06 2. Chemical Bonding 06-13 3. Coordination Compound 13-20 4. Metallurgy 21-27 5. Hydrogen, compound 28-30 6. S-Block 30-36 7. d and f Block Elements 36-41 8. p-block elements 41-52 9. Environmental Chemistry 52-57 10. Quantum Number 57-59 11. Salt Analysis 59-61 Chapter: Periodic Table Year 2020 1. The electron gain enthalpy (in kJ/mol) of fluorine, chlorine, bromine and iodine, respectively are: (1) – 333, – 349, – 325 and – 296 (2) –296, – 325, – 333 and – 349 (3) – 333, – 325, – 349 and – 296 (4) –349, – 333, – 325 and – 296 2. Within each pair of elements of F & Cl, S & Se, and Li & Na, respectively, the elements that release more energy upon an electron gain are– (1) F, Se and Na (2) F, S and Li (3) Cl, S and Li (4) Cl, Se and Na 3. The first ionization energy (in kJ/mol) of Na, Mg, Al and Si respectively, are: (1) 496, 737, 577, 786 (2) 786, 737, 577, 496 (3) 496, 577, 737, 786 (4) 496, 577, 786, 737 4. The increasing order of the atomic radii of the following elements is: (a) C (b) O (c) F (d) Cl (e) Br (1) (b) < (c) < (d) < (a) < (e) (2) (a) < (b) < (c) < (d) < (e) (3) (d) < (c) < (b) < (a) < (e) (4) (c) < (b) < (a) < (d) < (e) 5. B has a smaller first ionization enthalpy than Be. Consider the following statements: (I) It is easier to remove 2p electron than 2s electron (II) 2p electron of B is more shielded from the nucleus by the inner core of electrons than the 2s electrons of Be. (III) 2s electron has more penetration power than 2p electron. (IV) atomic radius of B is more than Be (Atomic number B = 5, Be = 4) The correct statements are: (1) (I), (II) and (III) (2) (II), (III) and (IV) (3) (I), (III) and (IV) (4) (I), (II) and (IV) 6. The correct order of the ionic radii of O2–, N3–, F–, Mg2+, Na+ and Al3+ is: (1) Al3+ < Na+ < Mg2+ < O2–< F– < N3– (2) N3– < O2– < F– < Na+ < Mg2+ < Al3+ (3) Al3+ < Mg2+ < Na+ < F– < O2– < N3– (4) N3– < F– < O2– < Mg2+ < Na+ < Al3+ 7. Lattice enthalpy and enthalpy of solution of NaCl are 788 kJ mol–1 and 4 kJ mol–1, respectively. The hydration enthalpy of NaCl is: (1) –780 kJ mol–1 (2) –784 kJ mol–1 (3) 780 kJ mol–1 (4) 784 kJ mol–1 8. The process that is NOT endothermic in nature is: 2 (1) Ar(g) + e– Ar(g) (2) H(g) + e– H(g) (3) Na(g) + Na(g) e– (4) O(g) + e– O(g)     9. The ionic radii of O2–, F–, Na+ and Mg2+ are in the order: (1) F– > O2– > Na+ > Mg2+ (2) Mg2+ > Na+ > F– > O2– (3) O2– > F– > Mg2+ > Na+ (4) O2– > F– > Na+ > Mg2+ 10. The elements with atomic numbers 101 and 104 belong to, respectively: (1) Group 11 and Group 4 (2) Actinoids and Group 4 (3) Actinoids and Group 6 (4) Group 6 and Actinoids JEE Mains (Previous Year Questions) 2020-21-22 1 For More Material Join: @JEEAdvanced_2024 11. The five successive ionization enthalpies of an element are 800, 2427, 3658, 25024 and 32824 kJ mol–1. The number of valence electrons in the element is: (1) 2 (2) 3 (3) 4 (4) 5 12. Among the statements (I – IV), the correct ones are: (I) Be has smaller atomic radius compared to Mg. (II) Be has higher ionization enthalpy than Al. (III) Charge/radius ratio of Be is greater than that of Al. (IV) Both Be and Al form mainly covalent compounds. (1) (I), (II) and (IV) (2) (II), (III) and (IV) (3) (I), (II) and (III) (4) (I), (III) and (IV 13. The atomic number of the element unnilennium is: (1) 119 (2) 108 (3) 102 (4) 109 14. Three elements X, Y and Z are in the 3rd period of the periodic table. The oxides of X, Y and Z, respectively, are basic, amphoteric and acidic. The correct order of the atomic numbers of X, Y and Z is: (1) Z < Y < X (2) X < Z < Y (3) X < Y < Z (4) Y < X < Z 15. In general, the property (magnitudes only) that shows an opposite trend in comparison to other properties across a period is (1) Electronegativity (2) Electron gain enthalpy (3) Ionization enthalpy (4) Atomic radius 16. The atomic number of Unnilunium is ___. ANSWER KEY 1. (1) 2. (3) 3. (1) 4. (4) 5. (1) 6. (3) 7. (2) 8. (2) 9. (4) 10. (2) 11. (2) 12. (3) 13. (4) 14. (3) 15. (4) 16. (101.00) Chapter: Periodic Table Year 2021 1. Consider the elements Mg, Al, S, P and Si the correct increasing order of their first ionization enthalpy is: (1) Al < Mg < Si < S < P (2) Al < Mg < S < Si < P (3) Mg < Al < Si < S < P (4) Mg < Al < Si < P < S 2. The correct order of bond dissociation enthalpy of halogen is : (1) F2 > Cl2 > Br2 > I2 (2) Cl2 > F2 > Br2 > I2 (3) Cl2 > Br2 > F2 > I2 (4) I2 > Br2 > Cl2 > F2 3. Match List-I with List-II List – I List – II Electronic configuration of elements  iH in kJ mol–1 (a) 1s22s2 (i) 801 (b) 1s22s22p4 (ii) 899 (c) 1s 2s 2p 2 2 3 (iii) 1314 (d) 1s 2s 2p 2 2 1 (iv) 1402 (1) (a) − (ii), (b) − (iii), (c) − (iv), (d) − (i) (2) (a) − (iv), (b) − (i), (c) − (ii), (d) − (iii) (3) (a) − (i), (b) − (iv), (c) − (iii), (d) − (ii) (4) (a) − (i), (b) − (iii), (c) − (iv), (d) − (ii) JEE Mains (Previous Year Questions) 2020-21-22 2 For More Material Join: @JEEAdvanced_2024 4. The correct order of electron gain enthalpy is: (1) S > Se > Te > O (2) O > S > Se > Te (3) S > O > Se > Te (4) Te > Se > S > O 5. Given below are two statements: one is labelled as Assertion and the other is labelled as Reason R. Assertion A: In TII3 isomorphous to CsI3 the metal is present in +1 oxidation state. Reason R: TI metals has fourteen electrons in its electronic configuration. In the light of the above statements, choose the most appropriate answer from the options given below: (1) Both and are correct and is the correct explanation of A (2) A is not correct but is correct (3) Both and are correct is NOT the correct explanation of A (4) is correct but is not correct 6. Identify the elements X and Y using the ionisation energy values given below: Ionization energy (kJ/mol) 1st 2nd X 495 4563 Y 731 1450 (1) X = Na;Y = Mg (2) X = Mg;Y = F (3) X = Mg;Y = Na (4) X = F;Y = Mg 7. The characteristics of elements X, Y and Z with atomic numbers, respectively, 33, 53 and 83 are: (1) and are metalloids and is a metal. (2) is a metalloid, is a non-metal and is a metal. (3) X, and are metals. (4) and are non-metals and is a metalloid 8. The absolute value of the electron gain enthalpy of halogens satisfies: (1) I > Br > Cl > F (2) Cl > Br > F > I (3) Cl > F > Br > I (4) F > Cl > Br > I 9. Which of the following compound CANNOT act as a Lewis base? (1) NF3 (2) PCl5 (3) SF4 (4) ClF3 10. The set of elements that differ in mutual relationship from those of the other sets is: (1) Li −Mg (2) B – Si (3) Be – Al (4) Li – Na 11. The ionic radius of Na+ ions is 1.02\AA. The ionic radii (in\AA ) of Mg2+ and Al3+, respectively, are (1) 1.05 and 0.99 (2) 0.72 and 0.54 (3) 0.85 and 0.99 (4) 0.68 and 0.72 12. The first ionization energy of magnesium is smaller as compared to that of elements X and Y, but higher than that of Z. the elements X, Y and Z, respectively, are: (1) chlorine, lithium and sodium (2) argon, lithium and sodium (3) argon, chlorine and sodium (4) neon, sodium and chlorine 13. Which one of the following statements for D.I. Mendeleeff, is incorrect? (1) He authored the textbook Principles of Chemistry. (2) At the time, he proposed Periodic Table of elements structure of atom was known. (3) Element with atomic number 101 is named after him. (4) He invented accurate barometer. JEE Mains (Previous Year Questions) 2020-21-22 3 For More Material Join: @JEEAdvanced_2024 14. The ionic radii of F– and O2– respectively are 1.33 A and 1.4Å….., while the covalent radius of is 0.74Å.. The correct statement for the ionic radius of N3– from the following is: (1) It is smaller than F– and N (2) It is bigger than O2– and F– (3) It is bigger than F– and N, but smaller than of O2– (4) It is smaller than O2– and F–, but bigger than of N 15. Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A): Metallic character decreases and non-metallic character increases on moving from left to right in a period. Reason (R): It is due to increase in ionisation enthalpy and decrease in electron gain enthalpy, when one moves from left to right in a period. In the light of the above statements, choose the most appropriate answer from the options given below: (1) (A) is false but (R) is true. (2) (A) is true but (R) is false. (3) Both (A) and (R) are correct and (R) is the correct explanation of (A). (4) Both (A) and (R) are correct but (R) is not the correct explanation of (A). ANSWER KEY 1. (1) 2. (3) 3. (1) 4. (1) 5. (3) 6. (1) 7. (2) 8. (2) 9. (3) 10. (4) 11. (2) 12. (3) 13. (2) 14. (2) 15. (2) Chapter: Periodic Table Year 2022 1. The correct order of increasing ionic radii is (1) Mg2+ < Na+ < p– < O2– < N3– (2) N3– < O2– < p– < Na+ < Mg2+ (3) p– < Na+ < O2– < Mg2+ < N3– (4) Na+ < p– < Mg2+ < O2– < N3– 2. Given below are two statements: one is labelled as Assertion (A) and the other 1s labelled as Reason(R) Assertion (A): The ionic radii of O2– and Mg2+ are same. Reason (R): Both O2– and Mg2+ are isoelectronic species In the light of the above statements, choose the correct answer from the options given below (1) Both (A) and (R) are true and (R) is the correct explanation of (A) (2) Both (A) and (R) are true but (R) is not the correct explanation of (A) (3) (A) is true but (R) is false (4) (A) is false but (R) is true 3. Which of the following elements in considered as a metalloid? (1) Sc (2) Pb (3) Bi (4) Te 4. The IUPAC nomenclature of an element with electronic configuration [Rn]5f146d17s2 is: (A) Unnilbium (B) Unnilunium (C) Unnilquadium hon (D) Unniltrium JEE Mains (Previous Year Questions) 2020-21-22 4 For More Material Join: @JEEAdvanced_2024 5. Outermost electronic configurations elements A, B, C, D are given below: (A) 3s2 (B) 3s2 3p1 (C) 3s2 3p3 (D) 3s2 3p4 The correct order of first ionization enthalpy for them is: (1) (A)< (B) < (C) < (D) (2) (B) Si > P (2) P > Si > Be > Mg > Na (3) Si > P > Be > Na > Mg (4) Be > Na > Mg > Si > P 17. Which of the following pair of molecules contain odd electron molecule and an expanded octet molecule? (1) BCl3 and SF6 (2) NO and H2SO4 (3) SF6 and H2SO4 (4) BCl3 and NO ANSWER KEY 1. (1) 2. (4) 3. (4) 4. (4) 5. (2) 6. (3) 7. (2) 8. (2) 9. (1) 10. (2) 11. (1) 12. (4) 13. (4) 14. (4) 15. (3) 16. (1) 17. (2) Chapter: Chemical Bonding Year 2020 1. The dipole moments of CCl4, CHCl3 and CH4 are in the order: (1) CH4 = CCl4 < CHCl3 (2) CH4 < CCl4 < CHCl3 (3) CCl4 < CH4 < CHCl3 (4) CHCl3 < CH4 = CCl4 2. The relative strength of interionic/ intermolecular forces in decreasing order is: (1) ion-dipole > ion-ion > dipole-dipole (2) dipole-dipole > ion-dipole > ion-ion (3) ion-dipole > dipole-dipole > ion-ion (4) ion-ion > ion-dipole > dipole-dipole 3. The bond order and the magnetic characteristics of CN– are: 1 (1) 3, diamagnetic (2) 2 , paramagnetic 2 1 (3) 3, paramagnetic (4) 2 , diamagnetic 2 JEE Mains (Previous Year Questions) 2020-21-22 6 For More Material Join: @JEEAdvanced_2024 4. The predominant intermolecular forces present in ethyl acetate, a liquid, are: (1) hydrogen bonding and London dispersion (2) Dipole-dipole and hydrogen bonding (3) London dispersion and dipole-dipole (4) London dispersion, dipole-dipole and hydrogen bonding 5. Arrange the following bonds according to their average bond energies in descending order: C–Cl, C–Br, C–F, C–I (1) C–I > C–Br > C–Cl > C–F (2) C–Br > C–I > C–Cl > C–F (3) C–F > C–Cl > C–Br > C–I (4) C–Cl > C–Br > C–I > C–F 6. 'X' melts at low temperature and is a bad conductor of electricity in both liquid and solid state. X is: (1) Carbon tetrachloride (2) Mercury (3) Silicon carbide (4) Zinc sulphide 7. If the magnetic moment of a dioxygen species is 1.73 B.M, it may be: (1) O2 or O2 (2) O2 or O2 (3) O2 or O2 (4) O2, O2 or O2       8. The acidic, basic and amphoteric oxides, respectively, are: (1) MgO, Cl2O, Al2O3 (2) Cl2O, CaO, P4O10 (3) Na2O, SO3, Al2O3 (4) N2O3, Li2O, Al2O3 9. The number of sp2 hybrid orbitals in a molecule of benzene is: (1) 24 (2) 6 (3) 12 (4) 18 10. Among the sulphates of alkaline earth metals, the solubilities of BeSO4 and MgSO4 in water, respectively, are: (1) high and high (2) poor and poor (3) high and poor (4) poor and high 11. The number of CI = O bonds in perchloric acid is. “________”. 12. The increasing order of boiling points of the following compounds is: (1) I < IV < III < II (2) IV < I < II < III (3) I < III < IV < II (4) III < I < II < IV 13. The compound that has the largest H—M—H bond angle (M=N, O, S, C), is: (1) H2O (2) CH4 (3) NH3 (4) H2S 14. Hydrogen peroxide, in the pure state, is: (1) non-planar and almost colorless (2) linear and almost colorless (3) planar and blue in color (4) linear and blue in color JEE Mains (Previous Year Questions) 2020-21-22 7 For More Material Join: @JEEAdvanced_2024 15. The structure of PCl5 in the solid state is (1) square pyramidal (2) tetrahedral [PCl4]+ and octahedral [PCl6]– (3) square planar [PCl4]+ and octahedral [PCl6]– (4) trigonal bipyramidal 16. Among the following compounds, which one has the shortest C—Cl bond? (1) H3C–Cl (2) (3) (4) 17. The reaction in which the hybridisation of the underlined atom is affected is: H  (1) NH3  (2) XeF4 + SbF5 420K Disproportionation (3) H2SO4 + NaCl  (4) H3PO2  18. Of the species, NO, NO+, NO2+, NO–, the one with minimum bond strength is: (1) NO2+ (2) NO+ (3) NO (4) NO– 19. In a molecule of pyrophosphoric acid, the number of P–OH, P=O and P–O–P bonds/ moiety(ies) respectively are: (1) 3, 3 and 3 (2) 2, 4 and 1 (3) 4, 2 and 0 (4) 4, 2 and 1 20. Match the type of interaction in Column A with the distance dependence of their interaction energy in Column B: A B 1 (I) ion -ion (a) r 1 (II) dipole – dipole (b) 2 r 1 (III) London dispersion (c) r3 1 (d) 6 r (1) (I)-(a), (II)-(b), (III)-(c) (2) (I)-(a), (II)-(c), (III)-(d) (3) (I)-(a), (II)-(b), (III)-(d) (4) (I)-(b), (II)-(d), (III)-(c) 21. The molecular geometry of SF6 is octahedral. What is the geometry of SF4 (including lone pair(s) of electrons, if any)? (1) Trigonal bipyramidal (2) Square planar (3) Tetrahedral (4) Pyramidal 22. If AB4 molecule is a polar molecule, a possible geometry of AB4 is: (1) Square pyramidal (2) Tetrahedral (3) Square planar (4) Rectangular planar JEE Mains (Previous Year Questions) 2020-21-22 8 For More Material Join: @JEEAdvanced_2024 23. The shape/structure of [XeF5]– and XeO3F2, respectively, are: (1) pentagonal planar and trigonal bipyramidal (2) trigonal bipyramidal and pentagonal planar (3) octahedral and square pyramidal (4) trigonal bipyramidal and trigonal bipyramidal ANSWER KEY 1. (1) 2. (4) 3. (1) 4. (3) 5. (3) 6. (1) 7. (1) 8. (4) 9. (4) 10. (1) 11. (3.00) 12. (1) 13. (2) 14. (1) 15. (2) 16. (3) 17. (2) 18. (4) 19. (4) 20. (3) 21. (1) 22. (1) 23. (1) Chapter: Chemical Bonding Year 2021 1. AX is a covalent diatomic molecule where A and X are second row elements of periodic table. Based on Molecular orbital theory, the bond order of AX is 2.5. The total number of electrons in AX is____ (Round off to the Nearest Integer). 2. Which of the following are isostructural pairs? (A) SO24 and CrO24 (B) SiCl4 and TiCl4 (C) NH3 and NO3 (D) BCl3 and BrCl3 (1) A and C only (2) A and B only (3) B and C only (4) C and D only 3. The correct shape and I-I-I bond angles respectively in I3 ion are: (1) Trigonal planar; 120° (2) Distorted trigonal planar; 135° and 90° (3) Linear; 180° (4) T-shaped; 180° and 90° 4. According to molecular orbital theory, the species among the following that does not exist is: (1) He2 (2) He2 (3) O22 (4) Be2 2 5. Which among the following species has unequal bond lengths? (1) XeF4 (2) SiF4 (3) BF4 (4) SF4 6. Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R. Assertion A: Dipole-dipole interactions are the only non-covalent interactions, resulting in hydrogen bond formation Reason R: Fluorine is the most electronegative element and hydrogen bonds in HF are symmetrical In the light of the above statements, choose the most appropriate answer from the options given below: (A) A is false but R is true (B) Both A and R are true and R is the correct explanation of A (C) A is true but R is false (D) Both A and R are true and R is not the correct explanation of JEE Mains (Previous Year Questions) 2020-21-22 9 For More Material Join: @JEEAdvanced_2024 7. Match List-I with List-II. list-I list-II (Molecule) (Bond order) (a) Ne2 (i) 1 (b) N2 (ii) 2 (c) F2 (iii) 0 (d) O2 (iv) 3 Choose the correct answer from the options given below: (1) (a) − (iii), (b) − (iv), (c) − (i), (d) − (iii) (2) (a) − (i), (b) − (ii), (c) − (iii), (d) − (iv) (3) (a) − (ii), (b) − (i), (c) − (iv), (d) − (iii) (4) (a) − (iv), (b) − (iii), (c) − (ii), (d) − (i) 8. Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R: Assertion A: The H − O − H bond angle in water molecule is 104.5° Reason R: The lone pair − lone pair repulsion of electrons is higher than the bond pair - bond pair repulsion. (1) A is false but R is true (2) Both A and R are true, but R is not the correct correct explanation of A (3) A is true but R is false (4) Both A and R are true, and R is the correct explanation of A 9. A central atom in a molecule has two lone pairs of electrons and forms three single bonds. The shape of this molecule is: (1) see-saw (2) planar triangular (3) T-shaped (4) trigonal pyramidal 10. Amongst the following, the linear species is: (1) NO2 (2) Cl2O (3) O3 (4) N3 11. AX is a covalent diatomic molecule where A and X are second row elements of periodic table. Based on Molecular orbital theory, the bond order of AX is 25. The total number of electrons in AX is____ (Round off to the Nearest Integer). 12. The oxide that shows magnetic property is: (1) SiO2 (2) Mn3O4 (3) Na2O (4) MgO 13. In the following molecules, Hybridisation of carbon a, b and c respectively are: (1) sp3, sp, sp (2) sp3, sp2, sp (3) sp3, sp2, sp2 (4) sp3, sp, sp2 14. The number of species below that have two lone pairs of electrons in their central atom is_______ (Round off to the Nearest integer) SF4, BF4 CIF3, AsF3, PCl5, BrF5, XeF4, SF6 ANSWER KEY 1. 15.00 2. (2) 3. (3) 4. (4) 5. (4) 6. (3) 7. (1) 8. (4) 9. (3) 10. (4) 11. 15.00 12. (2) 13. (3) 14. (2) JEE Mains (Previous Year Questions) 2020-21-22 10 For More Material Join: @JEEAdvanced_2024 Chapter: Chemical Bonding Year 2022 1. Amongst BeF2, BF3, NH3, CCl4 the number of molecules with non-zero net dipole moment is____. 2. Consider the species CH4, NH4+ and BH4–. Choose the correct option with respect to the there species: (1) They are isoelectronic and only two have tetrahedral structures (2) They are isoelectronic and all have tetrahedral structures (3) Only two are isoelectronic and all have tetrahedral structures (4) Only two are isoelectronic and only two have tetrahedral structures 3. The total number of acidic oxides from the following list is: NO, N2O, B2O3, N2O5, CO, SO3, P4O10 (1) 3 (2) 4 (3) 5 (4) 6 4. Amongst the following the number of oxide(s) which are paramagnetic in nature is Na2O, KO2, NO2, N2O, ClO2, NO, SO2, Cl2O 5. The number of molecule(s) or ion(s) from the following having non-planar structure is NO3 , H2O2, BF3, PC13, XeF4, SF4, XeO3, PH4 , SO3, [Al(OH)4]– 6. Given below are two statements: One is labelled as Assertion A and the other is labelled as Reason R Assertion A: Zero orbital overlap is an out of phase overlap. Reason: It results due to different orientation/direction of approach of orbitals. In the light of the above statements. Choose the correct answer from the options given below (1) Both A and R are true and R is the correct explanation of A (2) Both A and Rare true but R is NOT the correct explanation of A (3) A is true but R is false (4) A is false but R is true 7. The correct order of bound orders of C22  ,N22 and O22 is, respectively. (1) C22  N22  O22 (2) O22  N22  O22 (3) C22  N22  O22 (4) N22  N22  O22 8. Bonding in which of the following diatomic molecule(s) become(s) stronger, on the basis of MO Theory, by removal of an electron? (1) NO (2) N2 (3) O2 (4) C2 (5) B2 9. Consider the ions/molecule O2 ,O2 ,O2 ,O22 For increasing bond order the correct option is : (1) O22  O2  O2  O2 (2) O2  O22  O2  O2 (3) O2  O22  O2  O2 (4) O2  O22  O2  O2 10. The oxide which contains an odd electron at the nitrogen atom is (1) N2O (2) NO2 (3) N2O3 (4) N2O5 11. Amongst SF4, XeF4, CF4 and H2O, the number of species with two lone pairs of electrons ____ JEE Mains (Previous Year Questions) 2020-21-22 11 For More Material Join: @JEEAdvanced_2024 12. Based upon VSEPR theory, match the shape (geometry) of the molecules in List-I with the molecules in List-II and select the most appropriate option List-I List-II (Shape) (Molecules) (A) T-shaped (I) XeF4 (B) Trigonal planar (II) SF4 (C) Square planar (III) ClF3 (D) See-saw (IV) BF3 (1) (A) -1, (B) - (11), (C) - (111), (D) - (IV) (2) (A) - (Ill), (B) - (IV), (C) - (I), (D) - (II) (3) (A) - (Ill), (B) - (IV), (C) - (II), (D) - (I) (4) (A) - (IV), (B) - (III), (C) - (I), (D) - (II) 13. Identify the incorrect statement for PCl5 from the following. (A) In this molecule, orbitals of phosphorous are assumed to undergo sp3 d hybridization. (B) The geometry of PCl5 is trigonal bi pyramidal. (C) PCl5 has two axial bonds stronger than three equatorial bonds. (D) The three equatorial bonds of PCl5 lie in a plane. 14. The correct order of increasing intermolecular hydrogen bond strength is (1) HCN < H2O < NH3 (2) HCN < CH4 < NH3 (3) CH4 < HCN < NH3 (4) CH4 < NH3 < HCN 15. The hybridization of P exhibited in PF5 is spxdy The value of y is 16. In the structure of SF4, the lone pair of electrons on ‘S’ is in: (1) equatorial position and there are two lone pairbond pair repulsions at 90° (2) equatorial position and there are three lone pair-bond pair repulsions at 90° (3) axial position and there are three lone pair - bond pair repulsion at 90°. (4) axial position and there are two lone pair - bond pair repulsion at 90°. 17. Number of lone pair (s) of electrons on central atom and the shape of BrF3 olecule respectively, are: (1) 0, triangular planar. (2) 1, pyramidal. (3) 2, bent T-shape. (4) 1, bent T -shape 18. Arrange the following in the decreasing order of their covalent character: (A) LiCl (B) NaCl (C) KCl (D) CsCl Question: Choose the most appropriate answer from the options given below: (1) (A)> (C) > (B)> (D) (2) (B) >(A)> (C) > (D) (3) (A)> (B) > (C) > (D) (4) (A)> (B) > (D) > (C) 19. Consider the species CH4, NH4 and BH4 Choose the correct option with respect to the there species: (1) They are isoelectronic and only two have tetrahedral structures (2) They are isoelectronic and all have tetrahedral structures (3) Only two are isoelectronic and all have tetrahedral structures (4) Only two are isoelectronic and only two have tetrahedral structures JEE Mains (Previous Year Questions) 2020-21-22 12 For More Material Join: @JEEAdvanced_2024  ANSWER KEY 1. 03.00 2. (2) 3. (2) 4. 04.00 5. 06.00 6. (1) 7. (2) 8. (3) 9. (1) 10. (2) 11. (3) 12. (2) 13. (2) 14. (2) 15. 01.00 16. (1) 17. (3) 18. (3) 19. (2) Chapter: Coordination Compound Year 2020 1. The theory that can completely/properly explain the nature of bonding in [Ni(CO)4] is: (1) Werner's theory (2) Crystal field theory (3) Valence bond theory (4) Molecular orbital theory 2. The IUPAC name of the complex [Pt(NH3)2Cl(NH2CH3)]Cl is: (1) Diammine (methanamine) chlorido platinum (II) chloride (2) Bisammine (methanamine) chlorido platinum (II) chloride (3) Diamminechlorido (aminomethane) platinum(II) chloride (4) Diamminechlorido (methanamine) platinum (II) chloride 3. Among the statements(a)-(d), the incorrect ones are– (a) Octahedral Co(III) complexes with strong field ligands have very high magnetic moments (b) When 0 < P, the d-electron configuration of Co(III) in an octahedral complex is teeg4 eg2 (c) Wavelength of light absorbed by [Co(en)3]3+ is lower than that of [CoF6]3– (d) If the 0 for an octahedral complex of Co(III) is 18,000 cm–1, the t for its tetrahedral complex with the same ligand will be 16,000 cm–1 (1) (a) and (b) only (2) (c) and (d) only (3) (b) and (c) only (4) (a) and (d) only 4. The number of possible optical isomers for the complexes MA2B2 with sp3 and dsp2 hybridised metal atom, respectively, is: Note: A and B are unidentate neutral and unidentate monoanionic ligands, respectively (1) 0 and 0 (2) 0 and 2 (3) 0 and 1 (4) 2 and 2 5. The complex that can show fac-and mer-isomers is: (1) [Pt(NH3)2Cl2] (2) [Co(NH3)4Cl2]+ (3) [Co(NH3)3(NO2)3] (4) [CoCl2(en)2] 6. The volume (in mL) of 0.125 M AgNO3 required to quantitatively precipitate chloride ions in 0.3 g of [Co(NH3)6]Cl3 is. M [Co(NH3)6]Cl3 = 267.46 g/mol M AgNO3 = 169.87 g/mol 7. Among (a) – (d) the complexes that can display geometrical isomerism are: (a) [Pt(NH3)3Cl]+ (b) [Pt(NH3)Cl5]– (c) [Pt(NH3)2Cl(NO2)] (d) [Pt(NH3)4ClBr]2+ (1) (d) and (a) (2) (a) and (b) (3) (b) and (c) (4) (c) and (d) 8. The correct order of the calculated spin-only magnetic moments of complexes (A) to (D) is: (A) Ni(CO)4 (B) [Ni(H2O)6]Cl2 (C) Na2[Ni(CN)4] (D) PdCl2(PPh3)2 (1) (A)  (C)  (D) < (B) (2) (A)  (C) < (B)  (D) (3) (C) < (D) < (B) < (A) (4) (C)  (D) < (B) < (A) 9. Complexes (ML5) of metals Ni and Fe have ideal square pyramidal and trigonal bipyramidal grometries, respectively. The sum of the 90°, 120° and 180° L-M L angles in the two complexes is _____. JEE Mains (Previous Year Questions) 2020-21-22 13 For More Material Join: @JEEAdvanced_2024 10. [Pd(F)(Cl)(Br)(I)]2– has n number of geometrical isomers. Then, the spin-only magnetic moment and crystal field stabilisation energy [CFSE] of [Fe(CN)6]n–6, respectively, are: [Note: Ignore the pairing energy] (1) 2.84 BM and –1.6 0 (2) 1.73 BM and –2.0 0 (3) 0 BM and –2.4 0 (4) 5.92 BM and 0 11. Complex X of composition Cr(H2O)6Cln has a spin only magnetic moment of 3.83 BM. It reacts with AgNO3 and shows geometrical isomerism. The IUPAC nomenclature of X is: (1) Tetraaquadichlorido chromium (III) chloride dihydrate (2) Hexaaqua chromium (III) chloride (3) Dichloridotetraaqua chromium (IV) chloride dihydrate (4) Tetraaquadichlorido chromium (IV) chloride dihydrate 12. The correct order of the spin-only magnetic moments of the following complexes is: (I) [Cr(H2O)6]Br2 (II) Na4[Fe(CN)6] (III) Na3[Fe(C2O4)3] (0 > P) (IV) (Et4N)2[CoCl4] (1) (III) > (I) > (II) > (IV) (2) (I) > (IV) > (III) > (II) (3) (II)  (I) > (IV) > (III) (4) (III) > (I) > (IV) > (II) 13. The isomer(s) of [Co(NH3)4Cl2] that has/have a Cl–Co–Cl angle of 90°, is/are: (1) meridional and trans (2) cis and trans (3) trans only (4) cis only 14. The species that has a spin only magnetic moment of 5.9 BM, is– (1) Ni(CO)4(Td) (2) [MnBr4]2–(Td) (3) [NiCl4]2–(Td) (4) [Ni(CN)4]2– (square planar) 15. For a d4 metal ion in an octahedral field, the correct electronic configuration is: 4 0 (1) t2g eg when 0< P (2) t2ge2g 2 when 0< P (3) t32geg1 when 0 < P (4) t32geg1 when 0 > P 16. Considering that 0 > P, the magnetic moment (in BM) of [Ru(H2O)6]2+ would be________. 17. Consider the complex ions, trans-[Co(en)2Cl2]+(A) and cis-[Co(en)2Cl2]+ (B). The correct statement regarding them is: (1) both (A) and (B) can be optically active (2) both (A) and (B) cannot be optically active (3) (A) can be optically active, but (B) cannot be optically active (4) (A) cannot be optically active, but (B) can be optically active 18. The total number of coordination sites in ethylenediaminetetraacetate (EDTA4–) is _______. 19. The values of the crystal field stabilization energies for a high spin d6 metal ion in octahedral and tetrahedral fields, respectively, are: (1) –0.4 0 and –0.27 t (2) –1.6 0 and –0.4 t (3) –0.4 0 and –0.6 t (4) –2.4 0 and –0.6 t 20. The molecule in which hybrid MOs involve only one d-orbital of the central atom is: (1) [Ni(CN)4]2– (2) [CrF6]3– (3) BrF5 (4) XeF4 JEE Mains (Previous Year Questions) 2020-21-22 14 For More Material Join: @JEEAdvanced_2024 21. The one that can exhibit highest paramagnetic behaviour among the following is: gly = glycinato; bpy = 2, 2'-bipyridine (1) [Pd(gly)2] (2) [Ti(NH3)6]3+ (3) [Co(OX)2(OH)2] (0 > P) – (4) [Fe(en)(bpy)(NH3)2]2+ 22. The crystal Field stabilization Energy (CFSE) of [CoF3(H2O)3] (0 < P) is: (1) –0.8 0 (2) –0.4 0 + P (3) –0.8 0 + 2P (4) –0.4 0 23. The pair in which both the species have the same magnetic moment (spin only) is: (1) [Mn(H2O)6]2+ and [Cr(H2O)]2+ (2) [Cr(H2O)6]2+ and [CoCl4]2– (3) [Cr(H2O)6]2+ and [Fe(H2O)6]2+ (4) [Co(OH)4]2– and [Fe(NH3)6]2+ 24. The number of isomers possible for [Pt(en)(NO2)2] is: (1) 3 (2) 2 (3) 1 (4) 4 25. Complex A has a composition of H12O6Cl3Cr. If the complex on treatment with conc. H2SO4 loses 13.5% of its original mass, the correct molecular formula of A is: [Given: atomic mass of Cr = 52 amu and Cl = 35 amu] (1) [Cr(H2O)5Cl]Cl2 · H2O (2) [Cr(H2O)3Cl3] · 3H2O (3) [Cr(H2O)4Cl2]Cl · 2H2O (4) [Cr(H2O)6]Cl3 26. The d-electron configuration of [Ru(en)3]Cl2 and [Fe(H2O)6]Cl2, respectively are: 4 2 (1) t2g eg and t62ge0g (2) t62ge0g and t62ge0g (3) t62ge0g and t2g 4 0 eg 4 0 (4) t2g 4 0 eg and t2g eg 27. The electronic spectrum of [Ti(H2O)6]3+ shows a single broad peak with a maximum at 20,300 cm–1. The crystal field stabilization energy (CFSE) of the complex ion, in kJ mol–1, is: (1) 242.5 (2) 83.7 (3) 145.5 (4) 97 28. The complex that can show optical activity is: (1) trans-[Fe(NH3)2(CN)4]– (2) cis-[Fe(NH3)2(CN)4]– (3) cis-[CrCl2(ox)2] (ox = oxalate) 3– (4) trans-[Cr(Cl2)(ox)2]3– 29. The one that is not expected to show isomerism is: (1) [Ni(NH3)4(H2O)2]2+ (2) [Ni(NH3)2Cl2] (3) [Pt(NH3)2Cl2] (4) [Ni(en)3]2+ 30. For octahedral Mn(II) and tetrahedral Ni(II) complexes, consider the following statements: (I) both the complexes can be high spin (II) Ni(II) complex can very rarely be low spin. (III) with strong field ligands, Mn(II) complexes can be low spin. (IV) aqueous solution of Mn(II) ions is yellow in color. The correct statements are: (1) (I), (III) and (IV) only (2) (II), (III) and (IV) only (3) (I), (II) and (III) only (4) (I) and (II) only 31. Consider that a d6 metal ion (M2+) forms a complex with aqua ligands, and the spin only magnetic moment of the complex is 4.90 BM. The geometry and the crystal field stabilization energy of the complex is: (1) tetrahedral and –1.6 t + 1P (2) tetrahedral and –0.6 t (3) octahedral and –1.6 0 (4) octahedral and –2.40 + 2P JEE Mains (Previous Year Questions) 2020-21-22 15 For More Material Join: @JEEAdvanced_2024 32. The oxidation states of iron atoms in compounds (A), (B) and (C), respectively, are x, y and z. The sum of x,y and z is. Na4[Fe(CN)5NOS)] Na4[FeO4] [Fe2(CO)9] (A) (B) (C) 33. Simplified absorption spectra of three complexes Mn+ ((i), (ii) and (iii)) of ion are provided below; their max values are marked as A, B and C respectively. The correct match between the complexes and their max values is: (i) [M(NCS)6](–6+n) (ii) [MF6]n+ (iii) [M(NH3)6]n+ (1) A-(ii), B-(i), C-(iii) (2) A-(iii), B-(i), C-(ii) (3) A-(ii), B-(iii), C-(i) (4) A-(i), B-(ii), C-(iii) ANSWER KEY 1. (4) 2. (4) 3. (4) 4. (1) 5. (3) 6. (26.60 to 27.00) 7. (4) 8. (1) 9. (20) 10. (2) 11. (1) 12. (2) 13. (4) 14. (2) 15. (3) 16. (00) 17. (4) 18. (6) 19. (3) 20. (1) 21. (3) 22. (4) 23. (3) 24. (1) 25. (3) 26. (3) 27. (4) 28. (3) 29. (2) 30. (3) 31. (2) 32. (6) 33. (2) Chapter: Coordination Compound Year 2021 1. The calculated magnetic moments (spin only value) for species [FeCl4]2−, [Co(C2O4)3]3− and MnO24 respectively are: (1) 5.92,4.90 and 0 BM (2) 5.82, O and 0 BM (3) 4.90,0 and 1.73 BM (4) 4.90,0 and 2.83 BM 2. The hybridization and magnetic nature of [Mn(CN)6]4− and [Fe(CN)6]3−, respectively are: (1) d2dp3 and paramagnetic (2) sp3d2 and paramagnetic (3) d dp and diamagnetic 2 3 (4) sp3d2 and diamagnetic 3. Given below are two statements: Statement I: The identification of Ni2+ is carried out by dimethyl glyoxime in the presence of NH4OH Statement II: The dimethyl glyoxime is a bidentate neutral ligand. In the light of the above statements, choose the correct answer from the options given below: (1) Both statement I and statement II are true (2) Both statement I and statement II are false (3) Statement I is false but statement II is true (4) Statement I is true but statement II is false JEE Mains (Previous Year Questions) 2020-21-22 16 For More Material Join: @JEEAdvanced_2024 4. If which of the following order the given complex ions are arranged correctly with respect to their decreasing spin only magnetic moment? (i) [FeF6]3− (ii) [Co(NH3)6]3+ (iii) [NiCl4]2− (iv) [Cu(NH3)4]2+ (1) (ii) > (i) > (iii) > (iv) (2) (iii) > (iv) > (ii) > (i) (3) (ii) > (iii) > (i) > (iv) (4) (i) > (iii) > (iv) > (ii) 5. The spin only magnetic moment of a divalent ion in aqueous solution (atomic number 29) is ____ BM. 6. Number of bridging CO ligands in [Mn2(CO)10] is 7. The number of stereoisomers possible for [Co(Ox)2(Br) (NH3)]2− is ____ [Ox = oxalate] 8. The equivalents of ethylene diamine required to replace the neutral ligands from the coordination sphere of the trans-complex of CoCl3·4NH3 is____. (Round off to the Nearest Integer). 9. [Ti(H2O)6]3+ absorbs light of wavelength 498 nm during a d − d transition. The octahedral splitting energy for the above complex is ___ × 10−19 J. (Round off to the Nearest Integer). h= 6.626 × 10−34 Js; c = 3 × 108 ms−1 10. Match List-I with List-II: List I List II (a) [Co(NH3)6] [Cr(CN)6] (i) Linkage isomerism (b) [Co(NH3)3 (NO2)3] (ii) Solvate isomerism (c) [Cr(H2O)6]Cl3 (iii) Co-ordination isomerism (d) cis-[CrCl2(ox)2] 3– (iv) Optical isomeris Choose the correct answer from the options given below: (1) (a) − (iii), (b) − (i), (c) − (ii), (d) − (iv) (2) (a)-(iv), (b)-(ii), (c)-(iii), (d)-(i) (3) (a)-(ii), (b)-(i), (c)-(iii), (d)-(iv) (4) (a)-(i), (b)-(ii), (c)-(iii), (d)-(iv) 11. The correct structures of trans-[NiBr2(PPh3)2] and meridonial-[Co(NH3)3(NO2)3], respectively, are (1) (2) (3) (4) 12. The total number of unpaired electrons present in the complex K3[Cr(oxalate)3] is____. ANSWER KEY 1. (3) 2. (1) 3. (4) 4. (4) 5. 02.00 6. 00.00 7. 03.00 8. 02.00 9. 04.00 10. (1) 11. (4) 12. (3) JEE Mains (Previous Year Questions) 2020-21-22 17 For More Material Join: @JEEAdvanced_2024 Chapter: Coordination Compound Year 2022 1. Match List - I with List – II List-I List-II 2– (A) [PtCl4] (I) sp3d (B) BrF5 (II) d2sp3 (C) PCl5 (III) dsp2 (D) [Co(NH 3)6 (IV) sp3d2 (1) (A)(II), (B) (IV), (C) (I), (D) (III) (2) (A) (III) , (B) (IV), (C) (I), (D) (II) (3) (A) (III), (B) (I), (C) (IV), (D) (II) (4) (A) (II) , (B) (I), (C) (IV), (D) (III) 2. In the cobalt-carbonyl complex: [Co2(CO)8], number of Co–Co bonds is "X" and terminal CO ligands is "Y". X + Y =__ 3. Transition metal complex with highest value of crystal field splitting (0) will be (1) [Cr(H2O)6]3+ (2) [Mo(H2O)6]3+ (3) [Fe(H2O)6]3+ (4) [Os(H2O)]3+ 4. White precipitate of AgCl dissolves in aqueous ammonia solution due to formation of: (1) [Ag(NH3)4]Cl2 (2) [Ag(Cl)2(NH3)2] (3) [Ag(NH3)2]Cl (4) [Ag(NH3)Cl]Cl 5. If [Cu(H2O)4]2+ absorbs a light of wavelength 600 nm for d-d transition, then the value of octahedral crystal field splitting energy for [Cu(H2O)6]2+ will be_______ × 10–21 J. (Nearest Integer) (Given: h = 6.63 x 10–34Js and c = 3.08 x 108 ms–1) 6. Amongst FeCl3.3H2O, K3[Fe(CN)6] and [Co(NH3)6]Cl3, the spin-only magnetic moment value of the inner-orbital complex that absorbs light at shortest wavelength is _____ B.M. [nearest integer] 7. Which statement is not true with respect to nitrate ion test? (1) A dark brown ring is formed at the junction of two solutions. (2) Ring is formed due to nitroferrous sulphate complex. (3) The brown complex is [Fe(H2O)5(NO)]SO4. (4) Heating the nitrate salt with cone. H2SO4, light brown fumes are evolved. 8. The spin-only magnetic moment value of an octahedral complex among CoCl3.4NH3, NiCl2.6H2O and PtCl4.2HCl, which upon reaction with excess of AgNO3 gives 2 moles of AgCl is ____ B.M. (Nearest Integer) 9. Reaction of [Co(H2O)6]2+ with excess ammonia and in the presence of oxygen results into a diamagnetic product. Number of electrons present in t2g orbitals of the product is____. 10. Which of the following will have maximum stabilization due to crystal field? (1) [Ti(H2O)6]3+ (2) [Co(H2O)6]2+ (3) [Co(CN)6]3– (4) [Cu(NH3)4]2+ 11. Arrange the following coordination compounds in the increasing order of magnetic moments. (Atomic numbers: Mn= 25; Fe= 26) (A) [FeF6]3– (B) [Fe(CN)6]3– (C) [MnCl6]3– (high spin) (D) [Mn(CN)6]3– (1) A < B < D < C (2) B < D < C < A (3) A< C < D < B (4) B < D < A < C JEE Mains (Previous Year Questions) 2020-21-22 18 For More Material Join: @JEEAdvanced_2024 12. Given below are two statements: Statement I: [Ni(CN)4]2– is square planar and diamagnetic complex. with dsp2 hybridization for Ni but [Ni(CO)4] is tetrahedral. paramagnetic and with sp3-hybridication for Ni. Statement II: [NiCl4]2– and [Ni(CO)4] both have same d-electron configuration have same geometry and are paramagnetic. In light the above statements. choose the correct answer form the options given below: (1) Both Statement I and Statement II are true. (2) Both Statement I and Statement II are false. (3) Statement I is correct but statement II is false. (4) Statement I is incorrect but statement II is true. 13. Number of complexes which will exhibit synergic bonding amongst, [Cr(CO)6], [Mn(CO)5] and [Mni(CO)10] is______. 14. [Fe(CN)6]4– [Fe(CN)6]3– [Ti(CN)6]3– [Ni(CN)4]2– [Co(CN)6]3– Among the given complexes, number of paramagnetic complexes is____. 15. (a) CoCl3·4NH3 (b) CoCl3·5NH3 (c) COCl3·6NH3 and (d) COCl(NO3)2·5NH3 Number of complex(es) which will exist in cis trans is/are 16. Given below are two statements. Statement I: In CuSO4.5H2O, Cu-O bonds are present. Statement II: In CuSO4.5H2O, ligands coordinating with Cu(II) ion are O-and S-based ligands. In the light of the above statements, choose the correct answer from the options given below (1) Both Statement I and Statement II are correct (2) Both Statement I and Statement II are incorrect (3) Statement I is correct but Statement II is incorrect (4) Statement I is incorrect but Statement II is correct 17. Spin only magnetic moment of [MnBr6]4– is _____B.M. (round off to the closest integer) 18. Consider the following metal complexes: [Co(NH3)]3+ [CoCl(NH3)5]2+ [Co(CN)6]3– [Co(NH3)5(H2O)]3+ The spin-only magnetic moment value of the complex that absorbs light with shortest wavelength is B.M. (Nearest integer) 19. The correct order of energy of absorption for the following metal complexes is A: [Ni(en)3]2+, B: [Ni(NH3)6]2+, C: [Ni(H2O)6]2+ (1) C < B < A (2) B < C < A (3) C < A < B (4) A < C < B 20. The difference between spin only magnetic moment values of [Co(H2O)6]Cl2 and [Cr(H2O)6]Cl3 is. 21. The metal complex that is diamagnetic is (Atomic number: Fe, 26; Cu, 29) (1) K3[Cu(CN)4] (2) K2[Cu(CN)4] (3) K3[Fe(CN)4] (4) K4[FeCl6] 22. The conductivity of a solution of complex with formula CoCl3(NH3)4 corresponds to 1 : 1 electrolyte, then the primary valency of central metal ion is JEE Mains (Previous Year Questions) 2020-21-22 19 For More Material Join: @JEEAdvanced_2024 23. Low oxidation state of metals in their complexes are common when ligands: (1) have good  -accepting character (2) have good  -donor character (3) are havind good  -donating ability (4) are havind poor  -donating ability 24. Fe3+ cation gives a prussian blue precipitate on addition of potassium ferrocyanide solution due to the formation of: (1) [Fe(H2O)6]2 [Fe(CN)6] (2) Fe2[Fe(CN)6]2 (3) Fe3[Fe(OH)2(CN)4]2 (4) Fe4[Fe(CN)6]3 25. The spin only magnetic moment of the complex present In Fehling' s reagent is _____ B.M. (Nearest integer). 26. Total number of relatively more stable isomer(s) possible for octahedral complex [Cu(en)2(SCN)2] will be______. 27. Match List I with List II List II List I (Complex) (Hybridization) A Ni(CO)4 I sp3 B [Ni(CN)4 ]2– II sp3d2 C [CO(CN)6]3– III d2sp3 D [CoF6]3– IV dsp 3 Choose the correct answer from the options given below: (1) A-IV, B-1, C-III, D-II (2) A-1. B-IV, C-III, D-II (3) A-1. B-IV, C-II, D-III (4) A-IV, B-1, C-II. D-III 28. [Fe(CN)6]3– should be an inner orbital complex. Ignoring the pairing energy, the value of crystal field stabilization energy for this complex is (—)____0- (Nearest integer) 29. Octahedral complexes of copper (II) undergo structural distortion (Jahn-Teller). Which one of the given copper (II) complexes will show the maximum structural distortion? (en-ethylenediamine; H2N—CH2—CH2—NH2) (1) [Cu(H2O)6]SO4 (2) [Cu(en)(H2O)4]SO4 (3) cis-[Cu(en)2Cl2] (4) trans-[Cu(en)2Cl2] 30. Sum of oxidation state (magnitude) and coordination number of cobalt in Na[Co(bpy)Cl4] is____. (Given bpy = ) ANSWER KEY 1. (2) 2. (7) 3. (4) 4. (3) 5. (745) 6. (02.00) 7. (2) 8. (03.00) 9. (06.00) 10. (3) 11. (2) 12. (2) 13. (03.00) 14. (02.00) 15. (01.00) 16. (3) 17. (06.00) 18. (00.00) 19. (1) 20. (00.00) 21. (1) 22. (03.00) 23. (1) 24. (4) 25. (02.00) 26. (03.00) 27. (2) 28. (02.00) 29. (1) 30. (09.00) JEE Mains (Previous Year Questions) 2020-21-22 20 For More Material Join: @JEEAdvanced_2024 Chapter: Metallurgy Year 2020 1. The purest form of commercial iron is (1) scrap iron and pig iron (2) wrought iron (3) cast iron (4) pig iron 2. The refining method used when the metal and the impurities have low and high melting temperatures, respectively, is– (1) zone refining (2) liquation (3) vapour phase refining (4) distillation 3. Among the reactions (a) - (d), the reaction(s) that does/do not occur in the blast furnace during the extraction of iron is/are: (a) CaO + SiO2 CaSiO3 (b) 3Fe2O3 + CO 2Fe3O4 + CO2 1 (c) FeO + SiO2 FeSiO3 (d) FeO Fe + O2 2 (1) (c) and (d) (2) (a) and (d) (3) (d) (4) (a) 4. According to the following diagram, A reduces BO2 when the temperature is: (1) < 1400 °C (2) > 1400 °C (3) < 1200 °C (4) > 1200 °C but < 1400 °C 5. The element that can be refined by distillation is: (1) nickel (2) zinc (3) gallium (4) tin 6. Boron and silicon of very high purity can be obtained through: (1) vapour phase refining (2) electrolytic refining (3) liquation (4) zone refining 7. An Ellingham diagram provides information about: (1) the pressure dependence of the standard electrode potentials of reduction reactions involved in the extraction of metals. (2) the kinetics of the reduction process. (3) the temperature dependence of the standard Gibbs energies of formation of some metal oxides. (4) the conditions of pH and potential under which a species is thermodynamically stable. 8. The processes of calcination and roasting in metallurgical industries, respectively, can lead to: (1) Global warming and acid rain (2) Photochemical smog and ozone layer depletion (3) Global warming and photochemical smog (4) Photochemical smog and global warming JEE Mains (Previous Year Questions) 2020-21-22 21 For More Material Join: @JEEAdvanced_2024 9. Among statements (a) -(d), the correct ones are: (a) Lime stone is decomposed to CaO during the extraction of iron from its oxides. (b) In the extraction of silver, silver is extracted as an anionic complex. (c) Nickel is purified by Mond's process. (d) Zr and Ti are purified by Van Arkel method. (1) (c) and (d) only (2) (a), (c) and (d) only (3) (b), (c) and (d) only (4) (a), (b), (c) and (d) 10. Cast iron is used for the manufacture of: (1) wrought iron and pig iron (2) wrought iron and steel (3) wrought iron, pig iron and steel (4) pig iron, scrap iron and steel ANSWER KEY 1. (2) 2. (2) 3. (1) 4. (2) 5. (2) 6. (4) 7. (3) 8. (1) 9. (4) 10. (2) Chapter: Metallurgy Year 2021 1. The process that involves the removal of sulphur from the ores is: (1) Smelting (2) Roasting (3) Leaching (4) Refining 2. Which of the following reduction reaction CANNOT be carried out with coke? (1) Al2O3 Al (2) ZnO Zn (3) Fe2O3 Fe (4) Cu2O Cu 3. The point of intersection and sudden increase in the slope, in the diagram given below, respectively, indicates: (1) G = 0 and melting or boiling point of the metal oxide (2)G > 0and decomposition of the metal oxide (3)G < 0and decomposition of the metal oxide (4)G = 0 and reduction of the metal oxide JEE Mains (Previous Year Questions) 2020-21-22 22 For More Material Join: @JEEAdvanced_2024 4. Match List-I and List-II : List-I List-II (a) Haematite (i) Al2O3.xH2O (b) Bauxite (ii) Fe2O3 (c) Magnetite (iii) CuCO3. Cu(OH)2 (d) Malachite (iv) Fe3O4 Choose the correct answer from the options given below: (1) (a)-(ii), (b)-(iii), (c)-(i), (d)-(iv) (2) (a)-(iv), (b)-(i), (c)-(ii), (d)-(iii) (3) (a)-(i), (b)-(iii), (c)-(ii), (d)-(iv) (4) (a)-(ii), (b)-(1), (c)-(iv), (d)-(iii) 5. The chemical that is added to reduce the melting point of the reaction mixture during the extraction of aluminium is: (1) Cryolite (2) Bauxite (3) Calamine (4) Kaolite Official 6. Match list-I with list-II: List-I List-II (a) Mercury (i) Vapour phase refining (b) Copper (ii) Distillation refining (c) Silicon (iii) Electrolytic refining (d) Nickel (iv) Zone refining Choose the most appropriate answer from the option given below: (1) a − i, b − iv, c − ii, d − iii (2) a − ii, b − iii, c − i, d − iv (3) a − ii, b − iii, c − iv, d − i (4) a − ii, b − iv, c − iii, d − i 7. Which of the following ore is concentrated using group 1 cyanide salt? (1) Sphalerite (2) Siderite (3) Malachite (4) Calamine 8. The major components in "Gun Metal" are: (1) Al,Cu,Mg and Mn (2) Cu, Sn and Zn (3) Cu, Zn and Ni (4) Cu, Ni and Fe 9. Al2O3 was leached with alkali to get X. The solution of X on passing of gas Y, forms Z. respectively are: (1) X = Na [Al(OH)4] , Y = CO2, Z = Al2O3 ⋅ xH2O (2) X = Na [Al(OH)4] , Y = SO2, Z = Al2O3 (3) X = Al(OH)3, Y = SO2, Z = Al2O3 ⋅ xH2O (4) X = Al(OH)3, Y = CO2, Z = Al2O3 10. Match List-I with List-II List - I List-II (Metal) (Ores) (a) Aluminum (i) Siderite (b) Iron (ii) Calamine (c) Copper (iii) Kaolinite (d) Zinc (iv) Malachite Choose the correct answer from the options given below: (1) (a) − (iv), (b) − (iii), (c) − (ii), (d) − (i) (2) (a) − (i), (b) − (ii), (c) − (iii), (d) − (iv) (3) (a) − (iii), (b) − (i), (c) − (iv), (d) − (ii) (4) (a) − (ii), (b) − (iv), (c) − (i), (d) − (iii) 11. Ellingham diagram is a graphical representation of: (1) G vs T (2) (G – TS)vsT (3) G vs T (4) G vs P JEE Mains (Previous Year Questions) 2020-21-22 23 For More Material Join: @JEEAdvanced_2024 12. The major components of German Silver are: (1) Cu, Zn and Ag (2) Ge, Cu and Ag (3) Zn, Ni and Ag (4) Cu, Zn and Ni 13. The method used for the purification of Indium is: (1) van Arkel method (2) vapour phase refining (3) zone refining (4) Liquation 14. Match List-I with List-II List-I List-II (Ore) (Element Present) (a) Kemite (i) Tin (b) Cassiterite (ii) Boron (c) Calamine (iii) Fluorine (d) Cryolite (iv) Zinc Choose the most appropriate answer from the option given below: (1) (a) − (ii), (b) − (iv), (c) − (i), (d) − (iii) (2) (a) − (ii), (b) − (i), (c) − (iv), (d) − (iii) (3) (a) − (i), (b) − (iii), (c) − (iv), (d) − (ii) (4) (a) − (iii), (b) − (i), (c) − (ii), (d) − (iv) 15. Match List-I with List-II List-I List-II (a) Siderite (i) Cu (b) Calamine (ii) Ca (c) Malachite (iii) Fe (d) Cryolite (iv) Al (v) Zn Choose the correct answer from the options given below: (1) (a) − (i), (b) − (ii), (c) − (v), (d) − (iii) (2) (a) − (iii), (b) − (v), (c) − (i), (d) − (iv) (3) (a) − (i), (b) − (ii), (c) − (iii), (d) − (iv) (4) (a) − (iii), (b) − (i), (c) − (v), (d) − (ii) ANSWER KEY 1. (2) 2. (1) 3. (1) 4. (4) 5. (1) 6. (3) 7. (1) 8. (2) 9. (1) 10. (3) 11. (1) 12. (4) 13. (3) 14. (2) 15. (2) Chapter: Metallurgy Year 2022 1. Match List-I with List-II Choose the most appropriate answer form the options given below: (1) (A) - (IV), (B)- (III), (C) - (II), (D) - (I) (2) (A) - (IV), (B)- (I), (C) - (II), (D) - (III) (3) (A) - (II), (B)- (III), (C) - (I), (D) - (IV) (4) (A) - (III), (B)- (IV), (C) - (II), (D) - (I) JEE Mains (Previous Year Questions) 2020-21-22 24 For More Material Join: @JEEAdvanced_2024 2. Which of the following chemical reactions represents Hall-Process? (1) Cr2O3 + 2Al Al2O3 + 2Cr (2) 2Al2O3 + 3C AAl + 3CO2  2 (3) FeO + CO Fe + CO2 (4) 2 Au(CN)2  (aq)  Zn(s) 2Au(s)  zn(CN4 ) 3. (a) Baryte, (b) Galena, (c) Zinc blende and (d) Copper Pyrites. How many of these minerals are sulphide based? 4. Leaching of gold with dilute aqueous solution of NaCN in presence of oxygen gives complex [A], which on reaction with zinc forms the elemental gold and another complex [B]. [A] and [B], respectively are: (1) [Au(CN)4]– and [Zn(CN)2 (OH)2]2– (2) [Au(CN)2]– and [Zn(OH)4]2– (3) [Au(CN)2]– and [Zn(CN)4]2– (4) [Au(CN)4]2– and [Zn(CN)6]4– 5. Given below are two statements. Statement I: During electrolytic refining, blister copper deposits precious metals Statement II: In the process of obtaining pure copper by electrolysis method, copper blister is used to make the anode. In the light of the above statements, choose the correct answer from the options given below. (1) Both Statement I and Statement II are true. (2) Both Statement I and Statement II are false. (3) Statement I is true but Statement II is false. (4) Statement I is false but Statement II is true. 6. Given below are two statements: Statement I: According to the Ellingham diagram, any metal oxide with higher G° is more stable than the one with lower G°. Statement II: The metal involved in the formation of oxide placed lower in the Ellingham diagram can reduce the oxide of a metal placed higher in the diagram. In the light of the above statements, choose the most appropriate answer from the option given below: (1) Both statement I and Statement II are correct (2) Both statement I and Statement II are incorrect (3) Both statement I and Statement II are incorrect (4) Both statement I and Statement II are correct 7. The role of depressants in Troth Floation method is to (1) selectively prevent one component of the ore from coming to the froth. (2) reduce the consumption of oil for froth formation. (3) stabilize the forth. (4) enhance non-wettability of the mineral particles. 8. Match List-I with List-II List-I List-II (A) Concentration of (I) Aniline gold ore (B) Leaching of alumina (II) NaOH (C) Froth stabiliser (III) SO2 (D) Blister copper (IV) NaCN Choose the correct answer from the options given below. (1) (A) – (IV), (B) – (III), (C) – (II), (D) – (I) (2) (A) – (IV), (B) – (II), (C) – (I), (D) – (III) (3) (A) – (III), (B) – (II), (C) – (I), (D) – (IV) (4) (A) – (II), (B) – (IV), (C) – (III), (D) s – (I) JEE Mains (Previous Year Questions) 2020-21-22 25 For More Material Join: @JEEAdvanced_2024 9. Statement I: Leaching of gold with cyanide ion in absence of air /O2 leads to cyano complex of Au(III). Statement II: Zinc is oxidized during the displacement reaction carried out gold extraction. In the light of the above statements, choose the correct answer from the options given below. (1) Both Statement I and Statement II are correct (2) Both Statement I and Statement II are incorrect (3) Both Statement I and Statement II are incorrect (4) Both Statement I and Statement II are scorrect 10. Given are two statements one is labelled as Assertion A and other is labelled as Reason R. Assertion A: Magnesium can reduce Al2O3 at a temperature below 1350°C, while above 1350°C aluminum below 1350°C, while above 1350°C aluminum can reduce MgO Reason R: The melting and boiling points of magnesium are lower than those of aluminium. In light of above statements. choose most appropriate answer from the options given below: (1) Both A and R are correct. and R is correct explanation of A. (2) Both A and R are correct. but R is NOT the correct explanation of A. (3) A is correct R is not correct. (4) A is not correct. R is correct.s 11. In the metallurgical extraction of copper, following reaction is used: FeO + SiO2 FeSiO3 FeO and FeSiO3 respectively are.a (1) gangue and flux (2) flux and slag (3) slag and flux (4) gangue and slag 12. In isolation of which one of the following metals from their ores, the use of cyanide salt is not commonly involved? (1) Zinc (2) Gold (3) Silver (4) Copper 13. Match List I with List II. Choose the correct answer from the options given below: (1) A-I, B-II, C-III, D-IV (2) A-III, B-IV, C-II, D-I (3) A-IV, B-III, C-I, D-II (4) A-I, B-II, C-IV, D-III 14. The compound(s) that is(are) removed as slag during the extraction of copper is : (1) CaO (2) FeO (3) AhO3 (4) ZnO (5) NiO Choose the correct answer from the options given below: (1) (3) (4) Only (2) (1), (2), (5) Only (3) (1), (2) Only (4) (2) Only JEE Mains (Previous Year Questions) 2020-21-22 26 For More Material Join: @JEEAdvanced_2024 15. Given below are two statements. Statement I: Pig iron is obtained by heating cast iron with scrap iron. Statement II: Pig iron has a relatively lower carbon content than that of cast iron. In the light of the above statements, choose the correct answer from the options given below. (1) Both Statement I and Statement II are correct. (2) Both Statement I and Statement II are not correct. (3) Statement I is correct but Statement II is not correct (4) Statement I is not correct but Statement II is correct. 16. Refining using liquation method 1s the suitable for metals with: (1) Low melting point (2) High boiling point (3) High electrical conductivity (4) Less tendency to be soluble in melts than impurities 17. The metal that is not extracted from its sulphide ore is: (1) Aluminium (2) Lead (3) Iron (4) Zinc 18. Which of the fallowing methods are not used to refine any metal? (A) Liquation (B) Calcination (C) Electrolysis (D) Leaching (E) Distillation Choose the correct answer from the options given below: (1) B and D only (2) B, D and E only (3) A, B, D and E only (4) A, C and E only 19. Among the following ores Bauxite, Siderite, Cuprite, Calamine, Haematite, Kaolinite, Malachite, Magnetite, Sphalerite, Limonite, Cryolite, the number of principal ores if (of) iron is___ 20. Which of the reaction is suitable for concentrating ore by leaching process? (1) 2Cu2S + 302 2Cu2O + 2SO2 (2) Fe3O4 +CO 3FeO+CO2 (3) Al2O3 + 2NaOH + 3H20 2Na[ Al(OH)4 (4) Al2O3 +6Mg 6Mg0+4Al 21. In metallurgy the term "gangue" is used for: (1) Contamination of undesired earthy materials. (2) Contamination of metals, other than desired metal (3) Minerals which are naturally occuring in pure form (4) Magnetic impurities in an ore. 22. In liquation process used for tin (Sn), the metal: (1) is reacted with acid (2) is dissolved in water (3) is brought to molten form which is made to flow on a slope (4) is fused with NaOH. ANSWER KEY 1. (1) 2. (2) 3. (3) 4. (3) 5. (1) 6. (4) 7. (1) 8. (2) 9. (4) 10. (2) 11. (4) 12. (4) 13. (1) 14. (4) 15. (2) 16. (1) 17. (1) 18. (1) 19. (04.00) 20. (3) 21. (1) 22. (3) JEE Mains (Previous Year Questions) 2020-21-22 27 For More Material Join: @JEEAdvanced_2024 Chapter: Hydrogen, compound Year 2020 1. Dihydrogen of high purity (> 99.95%) is obtained through: (1) the electrolysis of warm Ba(OH)2 solution using Ni electrodes. (2) the reaction of Zn with dilute HCl (3) the electrolysis of brine solution. (4) the electrolysis of acidified water using Pt electrodes. 2. The one that is NOT suitable for the removal of permanent hardness of water is: (1) Treatment with sodium carbonate (2) Calgon's method (3) Clark's method (4) Ion-exchange method ANSWER KEY 1. (1) 2. (2) Chapter: Hydrogen, compound Year 2021 1. Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R. Assertion A: Hydrogen is the most abundant element in the Universe, but it is not the most abundant gas in the troposphere. Reason R: Hydrogen is the lightest element. In the light of the above statements, choose the correct answer from the given below (1) A is false but R is true (2) Both A and R are true and R is the correct explanation of A (3) A is true but R is false (4) Both A and R are true but R is NOT the correct explanation of A 2. Which of the following equation depicts the oxidizing nature of H2O2 ? (1) Cl2 + H2O2 2HCl + O2 (2) KIO4 + H2O2 KIO3 + H2O + O2 (3) 2I– + H2O2 + 2H+ I2 + 2H2O (4) I2 + H2O2 + 2OH– 2I– + 2H2O + O2 3. Statement about heavy water are given below A. Heavy water is used in exchange reactions for the study of reaction mechanisms B. Heavy water is prepared by exhaustive electrolysis of water C. Heavy water has higher boiling point than ordinary water D. Viscosity of H2O is greater than D2O (1) A and B only (2) A and D only (3) A, B and C only (4) A and C only 4. Calgon is used for water treatment. Which of the following statement is NOT true about calgon? (1) Calgon contains the 2nd most abundant element by weight in the earth's crust. (2) It is also known as Graham's salt. (3) It is polymeric compound and is water soluble. (4) It doesnot remove Cat ion by precipitation. 5. Which of the following forms of hydrogen emits low energy β− particles? (1) Proton H+ (2) Deuterium 21H (3) Protium 11H (4) Tritium 31 H JEE Mains (Previous Year Questions) 2020-21-22 28 For More Material Join: @JEEAdvanced_2024 6. Given below are two statements: Statement I: H2O2 can act as both oxidising and reducing agent in basic medium. Statement II: In the hydrogen economy, the energy is transmitted in the form of dihydrogen. In the light of the above statements, choose the correct answer from the options given below: (1) Both statement I and statement II are false (2) Both statement I and statement II are true (3) Statement I is true but statement II is false (4) Statement I is false but statement II is truea 7. The correct statements about H2O2 (A) used in the treatment of effluents. (B) used as both oxidising and reducing agents. (C) the two hydroxyl groups lie in the same plane. (D) miscible with water. Choose the correct answer from the options given below: (1) (A), (B), (C) and (D) (2) (A), (B) and (D) only (3) (B), (C) and(D) only (4) (A), (C) and(D) only 8. The INCORRECT statement(s) about heavy water is (are) (a) used as a moderator in nuclear reactor (b) obtained as a by-product in fertilizer industry. (c) used for the study of reaction mechanism (d) has a higher dielectric constant than water Choose the correct answer from the options given below: (1) (B) only (2) (C) only (3) (D) only (4) (B) and (D) only 9. In basic medium, H2O2 exhibits which of the following reactions? Mn2+ Mn4+ l2  l– PbS PbSO4 Choose the most appropriate answer from the options given below: (1) (A), (C) only (2) (A) only (3) (B) only (4) (A), (B) only ANSWER KEY 1. (2) 2. (3) 3. (3) 4. (1) 5. (4) 6. (2) 7. (2) 8. (3) 9. (4) Chapter: Hydrogen, compound Year 2022 1. The highest industrial consumption of molecular hydrogen is to produce compounds of element: (A) Carbon (B) Nitrogen (C) Oxygen (D) Chlorine 2. In the industrial production of which of the following, molecular hydrogen is obtained as a byproduct? (1) NaOH (2) Na metal (3) NaCl (4) Na2CO3 3. Boiling of hard water is helpful in removing the temporary hardness by converting calciumhydrogen carbonate and magnesium hydrogen carbonate to (1) CaCO3 and Mg(OH)2 (2) CaCO3 and M2CO3 (3) Ca(OH)2 and MgCO3 (4) Ca(OH)2 and Mg(OH)2 JEE Mains (Previous Year Questions) 2020-21-22 29 For More Material Join: @JEEAdvanced_2024 4. Hydrogen has three isotopes protium (1H), deuterium (2H or D) and tritium (3H or T). They have nearly same chemical properties but different physical properties. They differ in (1) number of protons (2) atomic number (3) electronic configuration (4) atomic mass 5. Which one of the following reactions indicates the reducing ability of hydrogen peroxide in basic medium? (1) HOCl + H2O2 H3O + + Cr+ O2 (2) PbS + 4H2O2 PbSO4 + 4H2O (3) 2MnO4 +3H2O2 2MnO2 +3O2 +2H2O+2OH– (4) Mn2+ + H2O2 Mn4+ + 2OH– ANSWER KEY 1. (2) 2. (1) 3. (1) 4. (4) 5. (3) Chapter: S-Block Year 2020 1. In the following reactions products(A) and (B), respectively, are: NaOH + Cl2 (A) + side products (hot and conc.) Ca(OH)2 + Cl2 (B) + side products (dry) (1) NaClO3 and Ca(OCl)2 (2) NaOCl and Ca(ClO3)2 (3) NaClO3 and Ca(ClO3)2 (4) NaOCl and Ca(OCl)2 2. When gypsum is heated to 393 K, it forms: (1) Dead burnt plaster (2) Anhydrous CaSO4 (3) CaSO4.5H2O (4) CaSO4.0.5H2O 3. A metal (A) on heating in nitrogen gas gives compound B. B on treatment with H2O gives a colourless gas which when passed through CuSO4 solution gives a dark blue-violet coloured solution. A and B respectively, are: (1) Mg and Mg3N2 (2) Na and NaNO3 (3) Mg and Mg(NO3)2 (4) Na and Na3N 4. Among the statements (a)-(d) the correct ones are: (a) Lithium has the highest hydration enthalpy among the alkali metals. (b) Lithium chloride is insoluble in pyridine. (c) Lithium cannot form ethynide upon its reaction with ethyne. (d) Both lithium and magnesium react slowly with H2O. (1) (a), (b) and (d) only (2) (b) and (c) only (3) (a), (c) and (d) only (4) (a) and (d) only JEE Mains (Previous Year Questions) 2020-21-22 30 For More Material Join: @JEEAdvanced_2024 5. Match the following compounds (Column-I) with their uses (Column-II): (1) (I)-(D), (II)-(A), (III)-(C), (IV)-(B) (2) I)-(B), (II)-(C), (III)-(D), (IV)-(A) (3) (I)-(C), (II)-(D), (III)-(B), (IV)-(A) (4) (I)-(B), (II)-(D), (III)-(A), (IV)-(C) 6. An alkaline earth metal 'M' readily forms water soluble sulphate and water insoluble hydroxide. Its oxide MO is very stable to heat and does not have rock-salt structure. M is: (1) Ca (2) Be (3) Mg (4) Sr 7. On combustion Li, Na and K in excess of air, the major oxides formed, respectively, are: (1) Li2O, Na2O and K2O2 (2) Li2O, Na2O2 and K2O (3) Li2O, Na2O2 and KO2 (4) Li2O2, Na2O2 and K2O2 8. If you spill a chemical toilet cleaning liquid on your hand, your first aid would be: (1) aqueous NH3 (2) vinegar (3) aqueous NaHCO3 (4) aqueous NaOH 9. The metal mainly used in devising photoelectric cells is: (1) Na (2) Rb (3) Li (4) Cs 10. Two elements A and B have similar chemical properties. They don't form solid hydrogencarbonates, but react with nitrogen to form nitrides. A and B, respectively, are: (1) Na and C (2) Li and Mg (3) Cs and Ba (4) Na and Rb ANSWER KEY 1. (1) 2. (4) 3. (1) 4. (3) 5. (4) 6. (2) 7. (3) 8. (3) 9. (4) 10. (2) Chapter: S-Block Year 2021 1. Number of amphoteric compounds among the following is (A) BeO (B) BaO (C) Be(OH)2 (D) Sr(OH)2 JEE Mains (Previous Year Questions) 2020-21-22 31 For More Material Join: @JEEAdvanced_2024 2. Match List–I with List-II List-I List-II (a) LiCl (i) 455.5 nm (b) NaCl (ii) 970.8 n, (c) RbCl (iii) 780.0 nm (d) CsCl (iv) 589.0 nm Choose the correct answer from the options given below: (1) (a) − (ii), (b) − (i), (c) − (iv), (d) − (iii) (2) (a) − (ii), (b) − (iv), (c) − (iii), (d) − (i) (3) (a) − (iv), (b) − (ii), (c) − (iii), (d) − (i) (4) (a) − (i), (b) − (iv), (c) − (ii), (d) − (iii) 3. The Correct set from the following in which both pairs are in correct order of melting point is (1) LiF > LiCl; NaCl > MgO (2) LiF > LiCl; MgO > NaCl (3) LiCl > LiF; NaCl > MgO (4) LiCl > LiF; MgO > NaCl 4. Among the following, number of metal/s which can be used as electrodes in the photoelectric cell is ____ (Integer answer). (A) Li (B) Na (C) Rb (D) Cs 5. Given below are two statements: Statement I: Both CaCl2 6H2O and MgCl2.8H2O undergo dehydration on heating. Statement II: is amphoteric whereas the oxides of other elements in the same group are acidic. In the light of the above statements, choose the correct answer from the options given below : (1) Statement I is false but statement II is true (2) Both statement I and statement II are false (3) Both statement I and statement II are true (4) Statement I is true but statement II is false 6. Statement I: Sodium hydride can be used as an oxidising agent. Statement II: The lone pair of electrons on nitrogen in pyridine makes it basic. Choose the CORRECT answer from the options given below: (1) Both statement I and statement II are false (2) Statement is true but statement II is false (3) Statement I is false but statement II is true (4) Both statement I and statement II are true 7. The correct order of conductivity of ions in water is : (1) Na+ > K+ > Rb+ > Cs+ (2) Cs+ > Rb+ > K+ > Na+ (3) K+ > Na+ > Cs+ > Rb+ (4) Rb+ > Na+ > K+ > Li+ 8. The functional groups that are responsible for the ion-exchange property of cation and anion exchange resins, respectively, are: (1) −SO3H and −NH2 (2) −SO3H and −COOH (3) −NH2 and −COOH (4) −NH2 and −SO3H 9. One of the by-products formed during the recovery of NH3 from Solvay process is : (1) Ca(OH)2 (2) NaHCO3 (3) CaCl2 (4) NH4Cl JEE Mains (Previous Year Questions) 2020-21-22 32 For More Material Join: @JEEAdvanced_2024 10. Match List-I with List-II List-I List-II (a) Ca(OCI)2 (i) Antacid 1 (b) CaSO4. H2O (ii) Cement 4 (c) CaO (iii) Bleach (d) CaCO3 (iv) Plaster of paris Choose the most appropriate answer from the options given below: (1) a – i, b – iv, c – iii, d – ii (2) a – iii, b – ii, c – iv, d – i (3) a – iii, b – iv, c – ii, d – i (4) a – iii, b – ii, c – I, d – iv 11. Given below are two statements: One is labelled as Assertion A and the other labelled as R reason Assertion A: During the boiling of water having temporary hardness, Mg(HCO3)2 is converted to MgCO3 Reason R: The solubility product of Mg(OH)2 is greater than that of MgCO3. In the light of the above statements, choose the most appropriate answer from the options given below: (1) Both and are true but is not the correct explanation of A (2) is true but is false (3) Both A and are true and is the correct explanation of A (4) A is false and is also false 12. The secondary valency and the number of hydrogen bonded water molecule(s) in CuSO4  5H2O, respectively, are (1) 6 and 4 (2) 4 and 1 (3) 6 and 5 (4) 5 and 1 13. Match List-I with List- II : List-I List-II (a) Be (i) Treatment of cancer (b) Mg (ii) Extraction of metals (c) Ca (iii) Incendiary bombs and signals (d) Ra (iv) Windows of X-ray tubes (v) Bearings for motor engines. Choose the most appropriate answer the option given below: (1) a − iv, b − iii, c − i, d − ii (2) a − iv, b − iii, c − ii, d − i (3) a − iii, b − iv, c − v, d − ii (4) a − iii, b − iv, c − ii, d – v ANSWER KEY 1. (2) 2. (2) 3. (2) 4. (1) 5. (2) 6. (3) 7. (2) 8. (1) 9. (3) 10. (3) 11. (4) 12. (2) 13. (2) JEE Mains (Previous Year Questions) 2020-21-22 33 For More Material Join: @JEEAdvanced_2024 Chapter: S-Block Year 2022 1. Which of the following statements are correct? (A) Both LiCl and MgCl2 are soluble in ethanol. (B) The oxides Li2O and MgO combine with excess of oxygen to give superoxide. (C) LiF is less soluble in water than other alkali metal fluorides. (D) Li2o is more soluble in water than other alkali metal oxides. Choose the most appropriate answer from the options given below: (1) (A) and (C) only (2) (A), (C) and (D) only (3) (B) and (C) only (4) (A) and (C) only 2. Which one of the following compounds is used as a chemical in certain type of fire extinguishers? (1) Baking Soda (2) Soda ash (3) Washing Soda (4) Caustic Soda 3. In the flame test of a mixture of salts, a green flame with blue centre was observed. Which one of the following cations may be present? (1) Cu2+ (2) Sr2+ (3) Ba2+ (4) Ca2+ 4. Which one of the following alkaline earth metal ions has the highest ionic mobility in its aqueous solution? (1) Be2+ (2) Mg2+ (3) Ca2+ (4) Sr2+ 5. The correct order of melting point is: (1) Be > Mg > Ca > Sr (2) Sr > Ca > Mg > Be (3) Be > Ca > Mg > Sr (4) Be > Ca > Sr > Mg 6. s-block element which cannot be qualitatively confirmed by the flame test is (1) Li (2) Na (3) Rb (4) Be 7. Addition of H2SO4 to BaO2 produces: (1) BaO, SO2 and H2O (2) BaHSO4 and O2 (3) BaSO4, H2 and O2 (4) BaSO4 and H2O2 8. BeCl2 reacts with LiAlH4 to give (1) Be+ Li[AICl4] + H2 (2) Be + AIH3 + LiCI + HCI (3) BeH2 + LiCI + AICl3 (4) (D) BeH2 + Li[AIC14] 9. BeO reacts with HF in presence of ammonia to give [A] which on thermal decomposition produces [B] and ammonium fluorides. Oxidation state of Be in [A] is _________ 10. Match the List-I with List-II. List-I List-II (Metal) (Emitted light wavelength) (A) Li (I) 670.8 (B) Na (II) 589.2 (C) Rb (III) 780.0 (D) Cs (IV) 455.5 Choose the most appropriate answer from the options given below: (1) (A)-(I), (B)-(II), (C)-(III), (D)-(IV) (2) (A)-(III), (B)-(II), (C)-(I), (D)-(IV) (3) (A)-(III), (B)-(I), (C)-(II), (D)-(IV) (4) (A)-(IV), (B)-(II), (C)-(I), (D)-(III) JEE Mains (Previous Year Questions) 2020-21-22 34 For More Material Join: @JEEAdvanced_2024 11. Amongst baking soda, caustic soda and washing soda carbonate anion is present in: (1) washing soda only. (2) washing soda and caustic soda only. (3) washing soda and baking soda only. (4) baking soda, caustic soda and washing soda. 12. Choose the correct order of density of the alkali metals: (1) Li < K < Na < Rb < Cs (2) Li < Na < K < Rb < Cs (3) Cs < Rb < K < Na < Li (4) Li < Na < K < Cs < Rb 13. The correct order of density is (1) Be > Mg > Ca > Sr (2) Sr > Ca > Mg > Be (3) Sr > Be > Mg > Ca (4) Be > Sr > Mg > Ca 14. Which of the following can be used to prevent the decomposition of H2O2? (1) Urea (2) Formaldehyde (3) Formic acid (4) Ethanol 15. Given below are two statements : one is labelled as Assertion A and the other is labelled as Reason R. Assertion A: LiF is sparingly soluble in water. Reason R: The ionic radius of Li+ ion is smallest among its group members, hence has least hydration enthalpy. In the light of the above statements, choose the most appropriate answer from the options given below. (1) Both A and R are true and R is the correct explanation of A (2) Both A and R are true but R is NOT the correct explanation of A (3) A is true but R is false (4) A is false but R is true 16. An element A of group 1 shows similarity to an element B belonging to group 2. If A has maximum hydration enthalpy in group 1 then B is: (1) Mg (2) Be (3) Ca (4) Sr 17. Which of the following statement is incorrect? (1) Low solubility of LiF in water is due to its small hydration enthalpy. (2) KO2 is paramagnetic. (3) Solution of sodium in liquid ammonia is conducting in nature. (4) Sodium metal has higher density than potassium metal 18. The products obtained during treatment of hard water using Clark's method are: (1) CaCO3 and MgCO3 (2) Ca(OH)2 and Mg(OH)2 (3) CaCO3 and Mg(OH)2 (4) Ca(OH)2 and MgCO3 19. Statement I: An alloy of lithium and magnesium is used to make aircraft plates. Statement II: The magnesium ions are important for cell-membrane integrity. In the light the above statements, choose the correct answer from the options given below (1) Both Statement I and Statement II are true (2) Both Statement I and Statement II are false (3) Statement I is true but Statement II is false (4) Statement I is false but Statement II is true JEE Mains (Previous Year Questions) 2020-21-22 35 For More Material Join: @JEEAdvanced_2024 20. Lithium nitrate and sodium nitrate, when heated separately, respectively, give : (1) LiNO2 and NaNO2 (2) Li2O and Na2O (3) Li2O (4) LiNO2 and Na2O 21. Portland cement contains 'X' to enhance the setting time. What is 'X'? 1 (1) CaSO4. H2O (2) CaSO4.2H2O (3) CaSO4 (4) CaCO3 2 ANSWER KEY 1. (1) 2. (1) 3. (1) 4. (4) 5. (1) 6. (4) 7. (4) 8. (3) 9. (2) 10. (1) 11. (1) 12. (1) 13. (3) 14. (1) 15. (3) 16. (1) 17. (1) 18. (3) 19. (2) 20. (3) 21. (2) Chapter: d and f Block Elements Year 2020 K2 Cr2O7 (s) dil.H2 SO4 1. NaCl  (A)  Conc.H2 SO4 (B)  (C) NaOH H2 O2 Determine total number of atoms in per unit formula of (A), (B) & (C) 2. Among the following least 3rd ionization energy is for (1) Mn (2) Co (3) Fe (4) Ni 3. Assertion: It has been found that for hydrogenation reaction the catalytic activity increases from group- 5 to group-11 metals with maximum activity being shown by groups 7-9 elements of the periodic table. Reason: For 7-9 group elements adsorption rate is maximum. (1) Both assertion and reason are correct and reason is correct exp I an ation of assertion. (2) Both assertion and reason are correct and reason is not correct explanation of assertion. (3) Assertion is true & reason is false. (4) Both are incorrect 4. Total number of Cr–O bonds in Chromate ion and dichromate ion is. 5. The oxidation states of transition metal atoms in K2Cr2O7, KMnO4 and K2FeO4, respectively, are x, y and z. The sum of x, y and z is 6. The incorrect statement is (1) Manganate and permanganate ions are paramagnetic (2) Manganate and permanganate ions are tetrahedral (3) Manganate ion is green in colour and permanganate ion is purple in colour (4) In manganate and permanganate ions, the  -bonding takes place by overlap of p-orbitals of oxygen and d-orbitals of manganese 7. The incorrect statement(s) among (a) - (c) is (are) (a)