12th Chemistry Model Paper Set 6 2025 PDF

OBJECTIVE SECTION Model Set- 6 OBJECTIVE TYPE QUESTION Instructions: Question Nos. 1 to 70 have four (C) Glucose (D) Urea options, out of which only one is correct. You 𝐑𝐓 6. E°...

OBJECTIVE SECTION Model Set- 6 OBJECTIVE TYPE QUESTION Instructions: Question Nos. 1 to 70 have four (C) Glucose (D) Urea options, out of which only one is correct. You 𝐑𝐓 6. E° = 𝐧𝐅 In Keq. This equation is called. have to mark your selected option, on the OMR- Sheet. Answer any 35 questions. (A) Gibbs equation (B) Nernst equation 35 × 1 = 35 (C) Gibbs Helmboltz equation 1. Quartz is (D) Vander Waal's equation (A) Crystalline solid (B) Amorphous solid 7. Which among the following relationship is correct? (C) Pseudo solid (D) Super cooled liquid (A) ∆r G = −nFE(cell) (B) ∆r G0 = −nFE 0 (cell) 2. Which of the following is an amorphous solid? (C) ∆r G0 = −RT In K (D) All are correct (A) Graphite (C) (B) Quartz Glass (SiO₂) 8. How many Faraday will be required to deposit (C) Chrome Alum (D) Silicon Carbide (SiC) 1089 of Ag from AgNO3 solution? 3. Schottky defect is observed in crystals when (A) 3F (B) 2F (A) some cations move from their lattice site to (C) 1F (D) 4F interstitial sites. 9. The rate of a chemical reaction (B) equal number of cations and anions are missing from the lattice. (A) increases with time (C) Some lattice sites are occupied by electrons (B) decreases with time (D) some impurity is present in the lattice. (C) may increase or decrease with time 4. Colligative properties of the solutions are those (D) remains constant with time properties which depend on- 10. The temperature coefficient of most of the (A) shapes of the particles reactions lies between which of the following? (B) nature of the solvent (A) 2 and 3 (B) 1 and 2 (C) nature of the particles only (C) 2 and 4 (D) 3 and 4 (D) number of the particles only 11. For which order half life period is independent of initial concentration? 5. Which of the following 0.1 M solution has highest osmotic pressure at 25°C ? (A) Zero (B) first (A) CaCl₂ (B) KCI (C) Second (D) Third  OBJECTIVE SECTION 12. The term 'Sorption' stands for 19. Which of the following gas cannot be collected over water? (A) adsorption (B) absorption (A) O2 (B) H2S (C) both absorption and adsorption (C) SO2 (D) N2 (D) desorption 20. Which element is not involved in group-17? 13. At high concentration of soap in water, soap behaves as (A) F (B) Cl (A) molecular colloid (C) Br (D) 0 (B) associated colloid 21. Which one of the following is diamagnetic ion? (C) macromolecular colloid (A) Co2+ (B) Ni2+ (D) lyophilic colloid (C) Cu2+ (D) Zn2+ 14. Which one of the following is not an ore of 22. Which of the following ions is coloured? zinc? (A) SC3+ (B) Ti4+ (A) Zinc blende (B) Calamine (C) Zn2+ (D) V2+ (C) Zincite (D) Bauxite 23. The electronic configuration of chromium (Z 15. Which of the following metals is purified by = 24) is - Hoope's process? (A) 1s2 2s2 2p6 3s2 3p6 3d4 4s2 (A) Cu (B) Al (B) 1s2 2s2 2p6 3s2 3p6 3d5 4s1 (C) Fe (D) Zn (C) 1s2 2s2 2p6 3s2 3p6 3d6 16. The number of P-O-P bonds in cyclic (D) 1s2 2s2 2p6 3s2 3p6 4s2 4p4 metaphospheric acid is- 24. The co-ordination number of Ni in (A) zero (B) two [Ni(NH₃)4]2+ is - (C) three (D) four (A) 2 (B) 4 17. The highest oxidation state of nitrogen in its (C) 6 (D) 3 compounds may be 25. Which among the following is not a double (A) +3 (B) +5 salt? (C) +4 (D) +1 (A) carnallite, KCI.MgCl2.6H₂O 18. The hybridization of nitrogen in ammonia is (B) Mohr's salt, FeSO4 (NH4)2SO4.6H2O (A) sp3 (B) sp2 (C) potash alum, KAI(SO4)2.12H₂O (C) sp (D) d2sp3  OBJECTIVE SECTION (D) Potassium ferrocyanide, K4[Fe(CN)6] (A) H2 (B) Pd-BaSO4 26. Which statement is incorrect? (C) Both (A) and (B) (D) None of these (A) Ni (CO)4 - Tetrahedral, paramagnetic 33. Which of the following gives brown-red precipitate with Fehling's solution? (B) [Ni (CN)4 ]2- - Square planar, diamagnetic (A) Acetaldehyde (CH3CHO) (C) [Ni (NH3)6 ]2+ Octahedral, paramagnetic (B) Acetone (CH3 COCH3) (D) [NiCl4 ]2- - Tetrahedral, paramagnetic (C) Acetic acid (CH3COOH) 27. Which following undergoes nucleophilic substitution exclusively by S1 mechanism? (D) Benzaldehyde (C6H5CHO) (A) ethyl chloride (B) isopropyl chloride 34. Iodoform test is not given by (C) chlorobenzene (D) benzyl chloride (A) Ethanol (B) Ethanal 28. CH3Br + AgF → CH3F + AgBr. This reaction is (C) pentan-2-one (D) pentan-3-one known as 35. Which of the following is obtained on heating (A) Finkelstein reaction aqueous solution of benzene diazonium chloride ? (B) Swarts reaction (A) Benzene (B) Benzyl alcohol (C) Sandmeyer's reaction (C) Phenol (D) Chlorobenzene 𝑪𝒖+𝑯𝑪𝒍 (D) Wurtz reaction 36. The reaction Ar𝑵+ 𝟐 + 𝑪𝒍− → ArCl + 29. General formula of Alkanol. N₂ + CuCl is named as- (A) CnH2nO (B) CnH2n+1O (A) sandmeyer reaction (C) CnH2n+2O (D) CnH2nO2 (B) Gattermann reaction 30. For the formation of lodoform which of the (C) claisen reaction following is heated with iodine and NaOH? (D) carbylamine reaction (A) CH₂OH (B) C₂H5OH 37. Which of the following is the strongest base in (C) CH3CI (D) C₂H5CN aqueous solution? 31. Formaldehyde on heating with NaOH solution (A) C6H5NH2 (B) CH3NH₂ gives (C) [CH3]2 NH (D) (CH₃)3 N (A) Formic acid (B) Acetone 38. On hydrolysis of starch, we finally get: (C) Methyl alcohol (D) Ethyl formate (A) Glucose (B) Fructose 32. Select the reagent (s) used in the Rosenmund (C) Both (D) Sucrose reduction.  OBJECTIVE SECTION 39. In DNA, thymine is hold by two hydrogen 46. Equanil is. bonds with the base (A) artificial sweetener (A) Adenine (B) Cytosine (B) tranquilizer (C) Thymine (D) Guanine (C) antihistamine (D) antifertility drug 40. The number of chiral carbon in glucose is- 47. If we mix a pentavalent impurity in the crystal (A) 6 (B) 5 lattice of germanium, the type of semiconductor formed will be : (C) 4 (D) 3 (A) p – type (B) n – type 41. Proteins are found to have two different types of secondary structures viz, a-helix and ẞ-pleated (C) Both (A) and (B) (D) None of the two sheet structure, a-helix structure of protein is 48. Cell reaction is spontaneous when : stabilized by: (A) E 0 red is positive (B) ∆G0 is negative (A) Peptide bonds (B) van der Waals forces (C) ∆G0 is positive (D) E 0 red is negative (C) Hydrogen bonds 49. Which of the following is a secondary cell ? (D) Dipole-dipole interactions (A) Leclanche cell (B) Lead storage 42. Teflon, styrine and neoprene are all (C) Concentration cell (D) All of these (A) Copolymers (B) Condensation polymers 50. Order of reaction for the rate equation , rate = (C) Homopolymers (D) Monomers k [𝐀]𝐱 [𝐁]𝐲 is 43. Dacron is a polymer of (A) x+y (B) x-y (A) glycol and formaldehyde (C) x (D) y (B) glycol and phenol 51. The influence of temperature on the rate of (C) glycol and phthalic acid reaction is determined by : (D) glycol and terephthalic acid (A) Van’t Hoff equation 44. Chloroquine is an (B) Gibb’s Helmholtz equation (A) analgesic (B) antibiotic (C) Nernst equation (C) antimalarial (D) antipyretic (D) Arrhenius equation 45. Over production of acid in stomach can be 52. Which of the following is an example of controlled by- absorption? (A) Antacid (B) Analgesic (A) Water on silica gel (C) Antipyretic (D) Antibiotic (B) H2O calcium chloride  OBJECTIVE SECTION (C) Hydrogen on finely divided nickel (C) H2S (D) HSO− 4 (D) Oxygen on metal surface 59. Main source of helium is – 53. Which of the following will show Tyndall (A) Air (B) Radium effect ? (C) Monazite (D) Water (A) Aqueous solution of NaCl 60. Which one of the following is diamagnetic (B) Aqueous solution of Sugar ion? (C) Aqueous solution of Soap above CMC (A) Co2+ (B) Ni2+ (D) Aqueous solution of Soap below CMC (C) Cu2+ (D) Zn2+ 54. Which of the following statements is true? 61. General electronic Configuration of lanthanides are – (A) All ores are minerals (A) (n-2) f 1 −14 (n-1) d0 −1 ns 2 (B) All minerals are ore (B) (n-2) f 10 −14 (n-1) d0−1 ns2 (C) All alkalis are not bases (C) (n-2) f 0 −14 (n-1) d10 ns2 (D) All of these (D) (n-2) d0 −1 (n-1) f 1−14 ns2 55. Which of the following statements is true? 62. Which of the following oxidation state is (A) All ores are minerals common for all lanthanoids? (B) All minerals are ore (A) +2 (B) +3 (C) All alkalis are not bases (C) +4 (D) +5 (D) All of these 63. The compound used as refrigerant are – 56. The important ore of Aluminium (Al) is - (A) CHCl3 (B) CCl4 (A) Bauxite (B) Cryollite (C) CF4 (D) CF2 Cl2 (C) Feldspar (D) Malachite 64. Which of the following alcohol contain 𝐂𝐬𝐩𝟑 − 57. The process of smelting involves reduction of 𝐎𝐇 bond? metal oxide with (A) Allylic alcohol (B) Vinyl alcohol (A) Al (B) C (C) Phenol (D) None of these (C) Mg (D) CO 65. Which is maximum soluble in water ? 58. Oleum is composed of H2SO4 and which (A) n – Butyl alcohol (B) Isobutyl alcohol constituent? (C) tert-Butyl alcohol (D) sec-Butyl alcohol (A) SO2 (B) SO3  OBJECTIVE SECTION 66. The general formula of aldehyde ketone is 4. What is denatured alcohol? (A) CnH2n+2O (B) CnH2nO 5. Explain the following- (C) CnH2n-2O (D) CnH2n+4O (i) Ligand (ii) Coordination Sphere and Ionisation sphere. 67. IUPAC name of 𝐂𝐇𝟑 𝐂𝐎𝐎𝐇 is - 6. Why do transition elements form coloured (A) Methanoic acid (B) Ethanoic acid compounds? Explain. (C) Propanoic acid (D) Methanol 7. Calculate the spin only magnetic moment of M2+ (aq) ion (Z = 27) 68. When acetylene is passed through dil. H2SO4 in the presence of HgSO4 the compound formed 8. Explain, why the valency of inert gas is zero? is 9. Why are halogens strong oxidising agents? (A) Ethyl alcohol (B) Acetone 10. What is carbogen? What is its use? (C) Acetaldehyde (D) Carbide of Hg 11. H₂O₂ exhibits bleaching property. Why? 69. Which of the following does not give aldol 12. H₂O is Liquid whereas H₂S is gas. Why? condensation? 13. What is Ring test? (A) Methanal (B) Ethanal Or. In the ring test of,𝐍𝐎𝟑 − ion, Fe2+ ion reduces nitrate lon to nitric oxide, which combines with (C) Propanone (D) Propanal Fe²*(aq) ion to form brown complex. Write the 70. Ascorbic acid is a - reactions involved in the formation of brown ring. 14. Cryolite is mixed with alumina for extraction (A) Vitamin (B) Enzyme of aluminium by the electrolytic process. Why? (C) Protein (D) Amino acid OR, What is the role of cryolite in the metallurgy ☑ SHORT ANSWER Questions of aluminium? Instructions: Question nos. 1 to 20 are short 15. What is Tyndall effect? Explain it. answer type questions. Answer any 10 questions. 16. What is Pseudo first order reaction? Each question carries 2 marks. Of, Define pseudo first order reaction. 10 × 2 = 20 17. Write two differences between order of reaction and molecularity of reactions. 1. Name the monomer and write the structure of any two of the following: 18. What is standard hydrogen electrode? (a) PVC (b) Nylon-6, 6 (c) Polythenes 19. What are ideal and non-ideal solutions? (d) Polyester Or, Write at least two differences between an ideal and a non-ideal solution. 2. Define and classify vitamins. 3. Hell-Volhard-Zelinsky (HVZ) reaction.  OBJECTIVE SECTION 20. Lithium forms bec crystals. Calculate the 6. What is the difference between Schottky defect atomic radius of lithium if the length of the side of and Frenkel defect? a unit cell of lithium is 351 pm. ☑ LONG ANSWER Questions Instructions: Question nos. 21 to 26 are long answer type questions. Each question carries 5 marks. Answer any 3 questions. 3 × 5 = 15 1. Discuss the following terms: (i) Co-ordination number (ii) Effective atomic number (iii) Central metal atom/ion (iv) Double salt (v) Co-ordination Compound 2. (a) What are the artificial sweetening agents ? Give two examples. (b) What are essential and non-essential amino acids? Give examples of each type. 3. How is aluminium extracted from bauxite ore? Discuss the principle involved in it. Or. Write the important ores of aluminium and discuss the principle of extraction of aluminium. 4. (a) State Faraday's 1st law of electrolysis. (b) State Faraday's 2nd law of electrolysis. (c) Where is electrolysis used? 5. Explain the following terms. (i) Mole fraction (ii) Molality (iii) Molarity