Topic: Ideal and non-ideal solutions· Solutions

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

1. Ethanol + Acetone

2. Benzene + Toluene

3. Acetone + Chloroform

4. Chloroethane + Bromoethane

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Answer: 1. Ethanol + Acetone

Positive deviation occurs when A-B attractions are weaker than A-A and B-B. Ethanol has strong hydrogen bonding; adding acetone breaks some of it, so vapour pressure rises above the Raoult value.

Benzene + toluene and chloroethane + bromoethane: nearly ideal.
Acetone + chloroform: hydrogen bond forms between them, negative deviation.

Answer: option (1).

Doubtly AI · 30 Oct 2026 AI-generated · not yet verified Report

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

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