Solution | Chemistry Past Years Papers MCQs | mosaicbro.com

Solution | Chemistry Past Years Papers MCQs

7 of 30 questions (Page 4 of 5)

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22 The molality of 98% H₂SO₄ (d=1.8 g/cm³) is:
Correct Answer: D
Explanation: For 100g solution: 98g H₂SO₄ (1 mol) in 2g H₂O ⇒ m = 1/0.002 = 500 m.
23 Which solution has highest boiling point?
Correct Answer: D
Explanation: AlCl₃ gives most particles (i=4) ⇒ greatest ΔTb.
24 The van't Hoff factor (i) for K₄[Fe(CN)₆] in dilute solution is:
Correct Answer: D
Explanation: K₄[Fe(CN)₆] → 4K⁺ + [Fe(CN)₆]⁴⁻ (i=5 for complete dissociation).
25 Which pair forms an ideal solution?
Correct Answer: B
Explanation: Benzene-toluene mixtures follow Raoult's law (similar structures).
26 The molal elevation constant depends on:
Correct Answer: B
Explanation: Kb is a solvent-specific property.
27 Reverse osmosis is used for:
Correct Answer: A
Explanation: Reverse osmosis removes salts from seawater.
28 The solubility of gas in liquid increases with:
Correct Answer: D
Explanation: Gas solubility increases with higher pressure and lower temperature (Henry's law).
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