Solution | Chemistry Past Years Papers MCQs | mosaicbro.com

Solution | Chemistry Past Years Papers MCQs

7 of 30 questions (Page 3 of 5)

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15 Chemical used to protect car radiators from freezing is:
Correct Answer: B
Explanation: Ethylene glycol lowers water's freezing point.
16 Which is a colligative property?
Correct Answer: D
Explanation: Vapor pressure lowering depends on solute amount (colligative).
17 The concentration of solute when in equilibrium with solid at a given temperature is called:
Correct Answer: A
Explanation: Definition of solubility.
18 Molar concentration is called:
Correct Answer: A
Explanation: Active mass = molar concentration in equilibrium expressions.
19 An aqueous solution of potassium acetate (CH₃COOK) is:
Correct Answer: B
Explanation: CH₃COO⁻ hydrolyzes to produce OH⁻ (basic solution).
20 2g of NaOH in 500 cm³ solution has molarity:
Correct Answer: D
Explanation: Moles = 2/40 = 0.05 ⇒ M = 0.05/0.5 = 0.1 M.
21 Which gives acidic solution in water?
Correct Answer: C
Explanation: NH₄⁺ hydrolyzes: NH₄⁺ + H₂O → NH₃ + H₃O⁺ (acidic).
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