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A binary solution made up of components A and B obeys Raoult’s law when the interaction between A and B molecules is

1. stronger than the interactions between A–A and B–B molecules
2. weaker than the interactions between A–A and B–B molecules
3. the same as the interactions between A–A and B–B molecules
4. such that the total volume of the solution differs from the sum of the volumes of solute and solvent

Correct answer: the same as the interactions between A–A and B–B molecules

Solution

An ideal (Raoult-obeying) solution forms when A-B interactions equal the A-A and B-B interactions. Stronger A-B interactions (the stored option) cause negative deviation, not ideal behaviour.

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