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Question 750012
JEE Chemistry · Hard

Solutions and Colligative Properties: JEE Advanced MCQ

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JEE AdvancedHardQuestion 750012

Question

For a non-ideal solution showing positive deviation from Raoult's law:
  1. A
    A-B interactions are weaker than A-A and B-B
    Correct
  2. B
    Mixing is exothermic
  3. C
    Vapour pressure is less than ideal
  4. D
    ΔHmix < 0

Correct answer

A-B interactions are weaker than A-A and B-B

Explanation

Positive deviation: A-B forces < A-A and B-B forces. Molecules escape more easily → higher vapour pressure than Raoult's law predicts. ΔHmix > 0 (endothermic). Example: ethanol + water (partially), acetone + CS₂.

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