NEET UG 2023 Chemistry Paper PDF

FINAL NEET(UG)–2023 (EXAMINATION) (Held On Sunday 7th MAY, 2023) CHEMISTRY TEST PAPER WITH ANSWER Chemistry : Section-A (Q. No. 051 to 085)...

FINAL NEET(UG)–2023 (EXAMINATION) (Held On Sunday 7th MAY, 2023) CHEMISTRY TEST PAPER WITH ANSWER Chemistry : Section-A (Q. No. 051 to 085) 51. Given below are two statements : one is labelled as (1) ® Assertion A and the other is labelled as Reason R : Assertion A : Metallic sodium dissolves in liquid ammonia giving a deep blue solution, which is paramagnetic. (2) Reason R : The deep blue solution is due to the formation of amide. In the light of the above statements, choose the correct answer from the options given below : (3) (1) Both A and R are true but R is NOT the correct explanation of A. (2) A is true but R is false (4) (3) A is false but R is true (4) Both A and R are true and R is the correct Ans. (4) explanation of A. 55. Which one is an example of heterogenous catalysis ? Ans. (2) (1) Hydrolysis of sugar catalysed by H+ ions. (2) Decomposition of ozone is presence of nitrogen 52. The conductivity of centimolar solution of KCl at 25°C is monoxide. 0.0210 ohm–1 cm–1 and the resistance of the cell (3) Combination between dinitrogen and dihydrogen to containing the solution at 25°C is 60 ohm. The value of form ammonia in the presence of finely divided iron. (4) Oxidation of sulphur dioxide into sulphur trioxide in cell constant is - the presence of oxides of nitrogen. (1) 3.28 cm–1 (2) 1.26 cm–1 Ans. (3) (3) 3.34 cm–1 (4) 1.34 cm–1 56. Given below are two statements : one is labelled as Assertion A and the other is labelled as Reason R. Ans. (2) Assertion A : Helium is used to dilute oxygen in diving 53. For a certain reaction, the rate = k [A]2 [B], when the apparatus. initial concentration of A is tripled keeping concentration Reasons R : Helium has high solubility in O2. of B constant, the initial rate would In the light of the above statements, choose the correct answer from the options given below : (1) increase by a factor of six (1) Both A and R are true but R is NOT the correct (2) increase by a factor of nine explanation of A. (3) increase by a factor of three (2) A is true but R is false (3) A is false but R is true (4) decrease by a factor of nine (4) Both A and R are true and R is the correct Ans. (2) explanation of A. 54. Identify product (A) is the following reaction : Ans. (2) 57. Amongst the following, the total number of species NOT having eight electrons around central atom in its outer Zn  Hg  conc.HCl (A)  2H 2 O most shell, is NH3, AlCl3, BeCl2, CCl4, PCl5 : (1) 2 (2) 4 (3) 1 (4) 3 Ans. (4) 1 58. The correct order of energies of molecular orbitals of N2 In the light of the above statements, choose the correct molecule, is answer from the options given below : (1) 1s  *1s  2s  * 2s  2pz  (1) Both A and R are true but R is NOT the correct explanation of A. (2px  2p y )  (* 2px  * 2p y )  * 2pz (2) A is true but R is false (2) 1s   1s  2s   2s  2pz  * * (3) A is false but R is true * 2pz  (2px  2p y )  (* 2px  * 2p y ) (4) Both A and R are true and R is the correct ® explanation of A. (3) 1s   1s  2s   2s  (2px  2p y )  * * Ans. (1) ( 2px   2p y )  2pz   2pz * * * 63. Consider the following reaction and identify the product (P). (4) 1s   1s  2s   2s  (2px  2p y )  * * CH3–CH–CH–CH3 2pz  (* 2px  * 2py )  * 2pz CH3 OH   HBr Product (P) Ans. (4) 3-Methylbutan-2-ol 59. Match List-I with List-II. List-I List-II (1) CH3CH=CH–CH3 A. Coke I. Carbon atoms are sp3 hybridised (2) CH3–CH–CH–CH3 B. Diamond II. Used as a dry lubricant CH3 Br C. Fullerene III. Used as a reducing agent CH3 D. Graphite IV. Cage like (3) CH3–C–CH2Br molecules CH3 Choose the correct answer from the options given below: (1) A-IV, B-I, C-II, D-III (2) A-III, B-I, C-IV, D-II Br (3) A-III, B-IV, C-I, D-II (4) CH3–C–CH2–CH3 (4) A-II, B-IV, C-I, D-III CH3 Ans. (2) 60. The number of  bonds,  bonds and lone pair of Ans. (4) electrons in pyridine, respectively are : 64. Given below are two statements : one is labelled as (1) 12, 3, 0 (2) 11, 3, 1 Assertion A and the other is labelled as Reason R : (3) 12, 2, 1 (4) 11, 2, 0 Ans. (2) Assertion A : In equation r G = –nFEcell, value of rG 61. The element expected to form largest ion to achieve the depends on n. nearest noble gas configuration is Reasons R : Ecell is an intensive property and rG is an (1) F (2) N extensive property. (3) Na (4) O In the light of the above statements, choose the correct Ans. (2) answer from the options given below : 62. Given below are two statements : one is labelled as (1) Both A and R are true and R is NOT the correct Assertion A and the other is labelled as Reason R. explanation of A. Assertion A : A reaction can have zero activation energy. (2) A is true but R is false Reasons R : The minimum extra amount of energy (3) A is false but R is true absorbed by reactant molecules so that their energy (4) Both A and R are true and R is the correct becomes equal to threshold value, is called activation explanation of A. energy. Ans. (4) 2 65. Which amongst the following options is correct graphical 68. Select the correct Statements from the following : representation of Boyle's Law? A. Atoms of all elements are composed of two fundamental particles. B. The mass of the electron is 9.10939×10–31 kg. C. All the isotopes of a given elements show same (1) chemical properties. D. Protons and electrons are collectively known as ® nucleons. E. Dalton's atomic theory, regarded the atom as an ultimate particle of matter. Choose the correct answer from the options given (2) below., (1) C,D and E only (2) A and E only (3) B,C and E only (4) A,B and C only Ans. (3) 69. A compound is formed by two elements A and B. The elements B forms cubic close packed structure and atoms (3) of A occupy 1/3 of tetrahedral voids. If the formula of the compound is AxBy, then the value of x + y is in option (1) 4 (2) 3 (3) 2 (4) 5 Ans. (4) 70. Given below are two statements: (4) Statement I : A unit formed by the attachment of a base to l' position of sugar is known as nucleoside Ans. (1) Statement II : When nucleoside is linked to phosphorous 66. In Lassaigne's extract of an organic compound, both nitrogen and sulphur are present, which gives blood red acid at 5'-position of sugar moiety, we get nucleotide. colour with Fe3+ due to the formation of- In the light of the above statements, choose the correct 4 (1) NaSCN (2)  Fe  CN  NOS answer from the options given below:  5  (1) Both Statement I and Statement II are false  Fe  SCN   2 (3) (4) Fe 4  Fe  CN 6  .xH 2 O 3 (2) Statement I is true but Statement II is false Ans. (3) 67. Identify the product in the following reaction : (3) Statement I is false but Statement II is true (4) Both Statement I and Statement II are true Ans. (2) 71. Which amongst the following molecules on polymerization produces neoprene? (1) Cl | (1) (2) H 2 C  C – CH  CH 2 (2) H2 C  CH  C  CH CH 3 (3) | H 2 C  C  CH  CH 2 (4) H2 C  CH  CH  CH2 (3) (4) Ans. (1) Ans. (1) 3 72. Taking stability as the factor, which one of the following 78. The relation between nm, (nm = the number of permissible represents correct relationship? values of magnetic quantum number (m)) for a given value (1) InI3 > lnI (2) AlCl > AlCl3 of azimuthal quantum number (l), is (3) TlI > TlI3 (4) TlCl3 > TlCl (1) l = 2nm + 1 (2) nm = 2l2 + 1 Ans. (3) nm  1 (3) nm = l + 2 (4) l = 73. Some tranquilizers are listed below. Which one from the 2 following belongs to barbiturates? Ans. (4) ® (1) Meprobamate (2) Valium 79. The stability of Cu2+ is more than Cu+ salts in aqueous (3) Veronal (4) Chlordiazepoxide solution due to - Ans. (3) (1) enthalpy of atomization. 74. Which of the following statements are NOT correct? (2) hydration energy. A. Hydrogen is used to reduce heavy metal oxides to metals. (3) second ionisation enthalpy. B. Heavy water is used to study reaction mechanism. (4) first ionisation enthalpy. C. Hydrogen is used to make saturated fats from oils Ans. (2) D. The H-H bond dissociation enthalpy is lowest as 80. Which one of the following statements is correct? compared to a single bond between two atoms of any (1) All enzymes that utilise ATP in phosphate transfer element. require Ca as the cofactor. E. Hydrogen reduces oxides of metals that are more (2) The bone in human body is an inert and unchanging active than iron. Choose the most appropriate answer from the options substance. given below: (3) Mg plays roles in neuromuscular function and (1) B,D only (2) D,E only interneuronal transmission. (3) A,B,C only (4) B,C,D,E only (4) The daily requirement of Mg and Ca in the human Ans. (2) body is estimated to be 0.2 - 0.3 g. 75. Intermolecular forces are forces of attraction and Ans. (4) repulsion between interacting particles that will include: 81. Which of the following reactions will NOT give primary A. dipole - dipole forces. amine as the product? B. dipole - induced dipole forces (1) CH3CN   Product (i ) LiAlH 4 C. hydrogen bonding (ii ) H 3 O D. covalent bonding (2) CH3NC   Product (i ) LiAlH 4 E. dispersion forces (ii ) H 3 O Choose the most appropriate answer from the options (3) CH3CONH2   Product (i ) LiAlH 4 (ii ) H 3 O given below : (1) A,B,C,D are correct (2) A,B,C,E are correct (4) CH3CONH2  2 Product Br / KOH (3) A,C,D,E are correct (4) B,C,D,E are correct Ans. (2) Ans. (2) 82. The given compound 76. Amongst the given options which of the following CH = CH – CH – CH 2 CH 3 molecules/ion acts as a Lewis acid? (1) H2O (2) BF3 X (3) OH– (4) NH3 Ans. (2) is an example of _____. 77. The right option for the mass of CO2 produced by heating 20 g of 20% pure limestone is (1) aryl halide (Atomic mass of Ca = 40) (2) allylic halide [CaCO3  CaO + CO2] 1200 K (3) vinylic halide (1) 1.76 g (2) 2.64 g (3) 1.32 g (4) 1.12 g (4) benzylic halide Ans. (1) Ans. (2) 4 83. Complete the following reaction : 87. Which amongst the following will be most readily dehydrated under acidic conditions ? OH conc.H SO O HCN 2 4 [C] NO 2 CN  OH OH H [A] [B] (1) H C (2) OH [C] is _____. 3 H OH NO 2 NO 2 OH ® (1) COOH (2) CHO (3) (4) CH 3 OH H (3) COOH (4) OH Ans. (1) 88. The equilibrium concentrations of the species in the Ans. (3) reaction A + B C + D are 2, 3, 10 and 6 mol L–1, 84. Homoleptic complex from the following complexes is : respectively at 300 K. G0 for the reaction is (1) Diamminechloridonitrito-N-platinum (II) (R = 2 cal/mol K) (2) Pentaamminecarbonatocobalt (III) chloride (1) –137.26 cal (2) –1381.80 cal (3) Triamminetriaquachromium (III) chloride (3) –13.73 cal (4) 1372.60 cal Ans. (2) (4) Potassium trioxalatoaluminate (III) 89. Given below are two statements : Ans. (4) Statement I : The nutrient deficient water bodies lead to 85. Weight (g) of two moles of the organic compound, which eutrophication. is obtained by heating sodium ethanoate with sodium Statement II : Eutrophication leads to decrease in the hydroxide in presence of calcium oxide is : level of oxygen in the water bodies. (1) 32 (2) 30 In the light of the above statements, choose the correct (3) 18 (4) 16 answer from the options given below : Ans. (1) (1) Both Statement I and Statement II are false (2) Statement I is correct but Statement II is false. Chemistry : Section-B (Q. No. 086 to 100) (3) Statement I is incorrect but Statement II is true. 86. Consider the following reaction (4) Both Statement I and Statement II are true.. Ans. (3) CH 2 –O HI A+ B 90. Which amongst the following options is the correct  relation between change in enthalpy and change in internal energy? Identify products A and B :- (1) H = U + ng RT (2) H – U = – nRT (3) H + U = nR (4) H = U – ngRT Ans. (1) 91. Match List-I with List-II : (1) A= CH 2 OH and B = I List-I List-II (Oxoacids of Sulphur) (Bonds) A. Peroxodisul- I. Two S-OH, Four S=O, (2) A= CH 2 I and B = OH phuric acid One S-O-S B. Sulphuric acid II. Two S-OH, One S=O C. Pyrosulphuric acid III. Two S-OH, Four S=O, CH 3 and B = I One S-O-O-S (3) A= D. Sulphurous acid IV. Two S-OH, Two S=O Choose the correct answer from the options given below: (1) A-III, B-IV, C-I, D-II (2) A-I, B-III, C-IV, D-II (4) A= CH 3 and B = OH (3) A-III, B-IV, C-II, D-I (4) A-I, B-III, C-II, D-IV Ans. (1) Ans. (2) 5 92. Identify the major product obtained in the following C. Basic character increases from V2O3 to V2O4 to reaction: V2O5. O D. V2O4 dissolves in acids to give VO34 salts. E. CrO is basic but Cr2O3 is amphoteric. Choose the correct answer from the options given +2[Ag(NH3)2]+ H below: (1) B and D only (2) C and D only O ® (3) B and C only (4) A and E only + 3 OH  – major product Ans. (2) 96. Consider the following compounds/species: O (1) (i) (ii) OH O (ii) (iv) (2) (v) (vi) COO– OH (3) (vii) COO– The number of compounds/species which obey Huckel's rule is ______. OH (1) 6 (2) 2 (3) 5 (4) 4 Ans. (4) (4) 97. What fraction of one edge centred octahedral void lies in one unit cell of fcc? OH 1 1 1 1 (1) (2) (3) (4) 3 4 12 2 Ans. (2) Ans. (2) 93. Pumice stone is an example of - 98. Which complex compound is most stable? (1)  Co  NH3 3  NO3 3  (1) gel (2) solid sol (3) foam (4) sol Ans. (2) (2)  CoCl 2 (en)2  NO3 94. The reaction that does NOT take place in blast furnace between 900 K to 1500 K temperature range during (3)  Co  NH3 6   SO 4 3 2 extraction of iron is : (1) FeO + CO Fe + CO2 (4)  Co  NH3 4  H2 O  Br   NO3 2 (2) C + CO2 2CO Ans. (2) (3) CaO + SiO2 CaSiO3 99. On balancing the given redox reaction, (4) Fe2O3 + CO 2FeO + CO2 aCr2 O72   bSO32  (aq)  cH  (aq) Ans. (4) c 95. Which of the following statements are INCORRECT ? 2aCr 3  (aq)  bSO24 (aq)  H O( ) 2 2 A. All the transition metals except scandium form MO oxides which are ionic. the coefficients a, b and c are found to be, respectively - B. The highest oxidation number corresponding to the (1) 3, 8, 1 (2) 1, 8, 3 group number in transition metal oxides is attained in (3) 8, 1, 3 (4) 1, 3, 8 Sc2O3 to Mn2O7. Ans. (4) 6 100. Identify the final product [D] obtained in the following sequence of reactions. CH3CHO  i ) LiAlH4 ii ) H O [A]  H2SO4  [B] 3 Br  HBr [C] [D] Na/dry ether (1) (2) C4H10 (3) HC  C Na+ (4) Ans. (4) 7