Chemistry MCQ Practice 19 — Science Foundation Course for Class 11 & 12

1. The Henry's law constant for a gas is high when:

(a) Solubility is high (b) Solubility is low (c) Temperature is low (d) Pressure is high

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Correct Answer: (b) Solubility is low

Explanation:
High K_H means low solubility

2. The colour of [Ti(H₂O)₆]³⁺ complex is due to:

(a) Charge transfer (b) d-d transition (c) f-f transition (d) Polarisation

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Correct Answer: (b) d-d transition

Explanation:
Ti³⁺ is d¹ system, shows d-d transition in visible region

3. Which of the following is a step growth polymer?

(a) Polythene (b) Teflon (c) Bakelite (d) Buna-S

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Correct Answer: (c) Bakelite

Explanation:
Phenol-formaldehyde resin is a step growth (condensation) polymer

4. The deficiency of which vitamin causes night blindness?

(a) Vitamin A (b) Vitamin B₁₂ (c) Vitamin C (d) Vitamin D

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Correct Answer: (a) Vitamin A

Explanation:
Vitamin A (retinol) is required for rhodopsin formation

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

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

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Correct Answer: (b) 3-Chloro-2-methylbutane

Explanation:
Longest chain with lowest number to substituent

6. The strongest acid among the following is:

(a) CH₃COOH (b) ClCH₂COOH (c) Cl₂CHCOOH (d) Cl₃CCOOH

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Correct Answer: (d) Cl₃CCOOH

Explanation:
More electron withdrawing Cl atoms increase acidity

7. For a zero order reaction, the half-life is proportional to:

(a) [A]₀ (b) 1/[A]₀ (c) [A]₀² (d) Independent of [A]₀

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Correct Answer: (a) [A]₀

Explanation:
t₁/₂ = [A]₀ / (2k) for zero order

8. The metal purified by zone refining is:

(a) Aluminium (b) Copper (c) Germanium (d) Iron

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Correct Answer: (c) Germanium

Explanation:
Zone refining is used for ultra-pure semiconductors like Ge and Si

9. The monomer of natural rubber is:

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

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Correct Answer: (a) Isoprene

Explanation:
Natural rubber is cis-1,4-polyisoprene

10. The co-enzyme derived from Vitamin B₁ is:

(a) NAD⁺ (b) FAD (c) TPP (d) Biotin

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Correct Answer: (c) TPP

Explanation:
Thiamine pyrophosphate (TPP) is coenzyme for decarboxylation