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A mixture of chloroform and acetone forms a solution that shows negative deviation from Raoult's law. The reason is that:
Athe molecules have equal molar masses
Bhydrogen bonding forms between unlike molecules
Cboth liquids are highly volatile by nature
Dno new interactions arise on mixing them
Answer & Solution
Correct answer: B. hydrogen bonding forms between unlike molecules
1. Negative deviation means A-B interactions are stronger than A-A and B-B interactions.
2. Chloroform forms a hydrogen bond with acetone (its H bonds to the carbonyl O).
3. This lowers the escaping tendency, reducing vapour pressure, giving negative deviation.
_Source: NCERT Class 12 Chemistry Ch 1 "Solutions", p.13_
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