alleryA negative deviation from Raoult law is expected when
AA-B interactions are weaker than A-A and B-B
BA-B interactions are stronger than A-A and B-B
CA and B are chemically identical
DA and B do not mix at all
Answer & Solution
Correct answer: B. A-B interactions are stronger than A-A and B-B
1. Non-ideal solutions can deviate from Raoult law positively or negatively.
2. Negative deviation happens when A-B intermolecular forces are STRONGER than A-A and B-B.
3. Stronger cross interactions reduce vapour pressure below the ideal prediction.
4. Example: HCl and water form a negatively deviating mixture (maximum boiling azeotrope).
_Source: syllabus Chemistry, Unit 1 "Solutions", §1.5_
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