Chemistry MCQ Practice 21 — Science Foundation Course for Class 11 & 12

1. The unit of rate constant for a zero-order reaction is:

(a) s⁻¹ (b) mol L⁻¹ s⁻¹ (c) L mol⁻¹ s⁻¹ (d) mol⁻² L² s⁻¹

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Correct Answer: (b) mol L⁻¹ s⁻¹

Explanation:
For zero-order: Rate = k → unit of k = unit of rate = mol L⁻¹ s⁻¹

2. Which of the following has the highest lattice energy?

(a) NaCl (b) MgO (c) LiF (d) CsCl

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Correct Answer: (b) MgO

Explanation:
Higher charges (+2, -2) and smaller ions → maximum lattice energy

3. The complex [Pt(NH₃)₂Cl₂] shows which type of isomerism?

(a) Optical (b) Geometrical (c) Ionisation (d) Linkage

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Correct Answer: (b) Geometrical

Explanation:
Square planar complex shows cis-trans isomerism

4. Which of the following is a homopolymer?

(a) Buna-S (b) Nylon-6,6 (c) Polythene (d) Bakelite

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Correct Answer: (c) Polythene

Explanation:
Made from single monomer (ethylene)

5. The vitamin that helps in blood clotting is:

(a) Vitamin A (b) Vitamin K (c) Vitamin C (d) Vitamin E

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Correct Answer: (b) Vitamin K

Explanation:
Essential for synthesis of prothrombin and other clotting factors

6. The IUPAC name of the compound CH₃-CH(Cl)-CH₂-CH₂-CH₃ is:

(a) 1-Chloropentane (b) 2-Chloropentane (c) 3-Chloropentane (d) 1-Chloro-2-methylbutane

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Correct Answer: (b) 2-Chloropentane

Explanation:
Longest chain with lowest number to substituent

7. The correct order of basic strength in aqueous solution is:

(a) (CH₃)₃N > (CH₃)₂NH > CH₃NH₂ > NH₃ (b) (CH₃)₂NH > CH₃NH₂ > (CH₃)₃N > NH₃ (c) CH₃NH₂ > (CH₃)₂NH > (CH₃)₃N > NH₃ (d) NH₃ > CH₃NH₂ > (CH₃)₂NH > (CH₃)₃N

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Correct Answer: (b) (CH₃)₂NH > CH₃NH₂ > (CH₃)₃N > NH₃

Explanation:
Secondary amine is strongest in aqueous solution due to +I effect and solvation balance

8. Which metal is extracted by the Mond process?

(a) Aluminium (b) Nickel (c) Copper (d) Zinc

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Correct Answer: (b) Nickel

Explanation:
Mond’s process uses volatile Ni(CO)₄

9. The monomer of Buna-N is:

(a) Butadiene + Styrene (b) Butadiene + Acrylonitrile (c) Isoprene (d) Chloroprene

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Correct Answer: (b) Butadiene + Acrylonitrile

Explanation:
Nitrile rubber (Buna-N)

10. The co-enzyme form of Vitamin B₂ is:

(a) NAD (b) FAD (c) TPP (d) Coenzyme A

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Correct Answer: (b) FAD

Explanation:
Riboflavin (Vitamin B₂) forms FAD and FMN