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Which of the following pairs of liquids exhibits positive deviation from Raoult’s law?

1. Water and nitric acid
2. Benzene and methanol
3. Water and hydrochloric acid
4. Acetone and chloroform

Correct answer: Benzene and methanol

Solution

Positive deviation occurs when A-B interactions are weaker than A-A/B-B. Mixing benzene with methanol breaks methanol H-bonds, raising vapour pressure above ideal -> positive deviation. Water-HCl and acetone-chloroform show negative deviation.

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