Chemistry MCQ Practice 17 — Science Foundation Course for Class 11 & 12

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

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

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Correct Answer: (b) MgO

Explanation:
Higher charge (Mg²⁺ and O²⁻) and smaller ionic radii lead to highest lattice energy

2. The geometry of [Ni(CN)₄]²⁻ complex is:

(a) Tetrahedral (b) Square planar (c) Octahedral (d) Trigonal bipyramidal

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Correct Answer: (b) Square planar

Explanation:
dsp² hybridisation for Ni²⁺ with strong field CN⁻ ligand

3. Which of the following is a condensation polymer?

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

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Correct Answer: (c) Nylon-6,6

Explanation:
Formed by condensation of hexamethylenediamine and adipic acid

4. The vitamin responsible for blood clotting is:

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

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Correct Answer: (b) Vitamin K

Explanation:
Vitamin K is essential for synthesis of clotting factors

5. The IUPAC name of the compound with structure CH₃-CH(CH₃)-CH₂-CH₂OH is:

(a) 3-Methylbutan-1-ol (b) 2-Methylbutan-1-ol (c) Pentan-1-ol (d) 2-Methylbutan-4-ol

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Correct Answer: (a) 3-Methylbutan-1-ol

Explanation:
Longest chain with -OH at position 1 and methyl at position 3

6. The correct order of boiling points is:

(a) HF > HCl > HBr > HI (b) HI > HBr > HCl > HF (c) HF > HI > HBr > HCl (d) HCl > HBr > HI > HF

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Correct Answer: (c) HF > HI > HBr > HCl

Explanation:
HF has strong hydrogen bonding

7. For the reaction A + 2B → C, if the rate = k[A][B]², the order with respect to B is:

(a) 1 (b) 2 (c) 3 (d) 0

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Correct Answer: (b) 2

Explanation:
Order w.r.t. B is the power of [B] in rate law

8. The ore of copper that is concentrated by froth flotation is:

(a) Bauxite (b) Haematite (c) Copper pyrites (d) Magnetite

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Correct Answer: (c) Copper pyrites

Explanation:
Sulphide ores are concentrated by froth flotation

9. The monomer of Buna-N rubber is:

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

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Correct Answer: (b) Butadiene + Acrylonitrile

Explanation:
Buna-N is nitrile rubber (copolymer)

10. The enzyme that hydrolyses starch to maltose is:

(a) Amylase (b) Pepsin (c) Lipase (d) Zymase

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Correct Answer: (a) Amylase

Explanation:
Salivary and pancreatic amylase act on starch