Question

The mixture which shows positive deviation from Raoult’s law is ______.

Options

• Ethanol + Acetone

• Benzene + Toluene

• Acetone + Chloroform

• Chloroethane + Bromoethane

Answer 1

The mixture which shows positive deviation from Raoult’s law is Ethanol + Acetone.

Explanation:

A positive deviation from Raoult’s law occurs when the A-B interactions are weaker than A-A or B-B, leading to increased vapour pressure. In the ethanol and acetone mixture, hydrogen bonding in pure ethanol is disrupted by acetone, which results in weaker overall interactions and a positive deviation.