Solution | Chemistry Past Years Papers MCQs | mosaicbro.com

Solution | Chemistry Past Years Papers MCQs

7 of 30 questions (Page 1 of 5)

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1 Depression in freezing point is directly proportional to:
Correct Answer: B
Explanation: ΔTf = Kf × m (directly proportional to molality, m).
2 Molarity of solution is expressed in:
Correct Answer: D
Explanation: Molarity = moles of solute per dm³ of solution (mol dm⁻³).
3 The number of moles of solute dissolved per dm³ of solution is called:
Correct Answer: A
Explanation: Definition of molarity (M = n/V in dm³).
4 Benzene-ether can form:
Correct Answer: A
Explanation: Similar intermolecular forces lead to ideal behavior.
5 In a mixture of 28 grams of N₂ and 96 grams of O₂, the mole fraction of N₂ is:
Correct Answer: C
Explanation: Moles N₂ = 1, O₂ = 3 ⇒ X_N₂ = 1/(1+3) = 0.25.
6 Which salt dissolves in water to form a solution with pH greater than 7?
Correct Answer: C
Explanation: Na₂CO₃ hydrolyzes to produce OH⁻ (basic solution).
7 The number of moles of solute per kilogram of solvent is called:
Correct Answer: A
Explanation: Definition of molality (m = n/kg solvent).
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