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Which of the following solutions shows positive deviation from Raoult's law?

1. Acetone + Aniline
2. Acetone + Ethanol
3. water + Nitric acid
4. Chloroform + Benzene

Correct answer: Chloroform + Benzene

Solution

Chloroform and benzene interact less favorably than their pure components, so molecules escape more easily into the vapor phase. That increases vapor pressure above Raoult’s law prediction, which is positive deviation.

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