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The mixture which shows positive deviation from Raoult's law is

1. Benzene + Toluene
2. Acetone + Chloroform
3. Chloroethane + Bromoethane
4. Ethanol + Acetone

Correct answer: Ethanol + Acetone

Solution

Ethanol and acetone show positive deviation from Raoult's law because the hydrogen bonding in ethanol is disrupted by the addition of acetone, leading to increased vapor pressure.

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