Here are most expected multiple-choice questions (MCQs) with answers for CBSE Class 12 Chemistry. These questions are based on the latest syllabus and exam pattern.
Chapter 1: Solid State
1. Which of the following is a crystalline solid?
a) Glass
b) Plastic
c) Diamond
d) Rubber
Ans: c) Diamond
2. The coordination number of Na⁺ in NaCl crystal is:
a) 4
b) 6
c) 8
d) 12
Ans: b) 6
3. Schottky defect in crystals is observed when:
a) Equal number of cations and anions are missing
b) A cation is missing from its lattice site
c) An extra cation is present in the interstitial site
d) Anion is missing from its lattice site
Ans: a) Equal number of cations and anions are missing
Chapter 2: Solutions
4. The colligative property that is used to determine the molar mass of a solute is:
a) Osmotic pressure
b) Vapour pressure
c) Surface tension
d) Viscosity
Ans: a) Osmotic pressure
5. A solution showing positive deviation from Raoult’s law means:
a) The intermolecular attraction between solute and solvent is strong
b) The intermolecular attraction between solute and solvent is weak
c) The solution forms an ideal solution
d) The enthalpy of mixing is negative
Ans: b) The intermolecular attraction between solute and solvent is weak
Chapter 3: Electrochemistry
6. In a galvanic cell, the anode is:
a) Positively charged
b) Negatively charged
c) Neutral
d) Either positively or negatively charged depending on the electrolyte
Ans: b) Negatively charged
7. The unit of molar conductivity is:
a) S cm² mol⁻¹
b) S cm mol⁻¹
c) S m⁻¹
d) Ohm m⁻¹
Ans: a) S cm² mol⁻¹
Chapter 4: Chemical Kinetics
8. The rate of reaction depends on:
a) Concentration of reactants
b) Temperature
c) Catalyst
d) All of these
Ans: d) All of these
9. A reaction is of first order if:
a) The rate is independent of the reactant concentration
b) The rate depends on the square of reactant concentration
c) The rate is directly proportional to reactant concentration
d) The rate depends on more than one reactant
Ans: c) The rate is directly proportional to reactant concentration
Chapter 5: Surface Chemistry
10. Which of the following is an example of physisorption?
a) Adsorption of gases on charcoal
b) Adsorption of O₂ on metal surfaces
c) Adsorption of H₂ on Ni
d) Adsorption of NH₃ on HCl
Ans: a) Adsorption of gases on charcoal
Chapter 6: General Principles and Processes of Isolation of Elements
11. The method used for refining of silicon is:
a) Zone refining
b) Liquation
c) Distillation
d) Electrolytic refining
Ans: a) Zone refining
Chapter 7: The p-Block Elements
12. The oxidation state of phosphorus in H₃PO₄ is:
a) +3
b) +5
c) +4
d) +2
Ans: b) +5
Chapter 8: The d- and f-Block Elements
13. The most stable oxidation state of Mn is:
a) +2
b) +3
c) +4
d) +7
Ans: d) +7
Chapter 9: Coordination Compounds
14. The coordination number of cobalt in [Co(NH₃)₆]³⁺ is:
a) 3
b) 4
c) 6
d) 8
Ans: c) 6
Chapter 10: Haloalkanes and Haloarenes
15. Which of the following is an example of a primary alkyl halide?
a) CH₃CH₂Cl
b) (CH₃)₂CHCl
c) (CH₃)₃CCl
d) C₆H₅Cl
Ans: a) CH₃CH₂Cl
Chapter 11: Alcohols, Phenols, and Ethers
16. Phenol reacts with bromine water to give:
a) o-Bromophenol
b) p-Bromophenol
c) 2,4,6-Tribromophenol
d) No reaction
Ans: c) 2,4,6-Tribromophenol
Chapter 12: Aldehydes, Ketones and Carboxylic Acids
17. Tollens’ reagent is used to test for:
a) Aldehydes
b) Ketones
c) Esters
d) Alcohols
Ans: a) Aldehydes
Chapter 13: Organic Compounds Containing Nitrogen
18. The correct order of basicity in aqueous solution is:
a) NH₃ > CH₃NH₂ > (CH₃)₂NH > (CH₃)₃N
b) (CH₃)₃N > (CH₃)₂NH > CH₃NH₂ > NH₃
c) NH₃ < CH₃NH₂ < (CH₃)₂NH < (CH₃)₃N
d) (CH₃)₂NH > CH₃NH₂ > (CH₃)₃N > NH₃
Ans: d) (CH₃)₂NH > CH₃NH₂ > (CH₃)₃N > NH₃
Chapter 14: Biomolecules
19. The primary structure of proteins is determined by:
a) Peptide bonds
b) Hydrogen bonds
c) Ionic bonds
d) Disulfide bonds
Ans: a) Peptide bonds
Chapter 15: Polymers
20. Which of the following is an example of a condensation polymer?
a) Polyvinyl chloride
b) Polystyrene
c) Nylon-6,6
d) Polyethylene
Ans: c) Nylon-6,6
Chapter 16: Chemistry in Everyday Life
21. The drug used as an analgesic is:
a) Aspirin
b) Chloramphenicol
c) Penicillin
d) Sulphadiazine
Ans: a) Aspirin
टिप्पणियाँ
एक टिप्पणी भेजें