Discussion
A binary solution containing two volatile solutes A and B shows positive deviation from Raoult's law. Which of the following statement is true?
Answer: B
The true statement is that the A-B interactions are weaker than the A-A or B-B interactions.
In a positive deviation, molecules escape from the mixture more easily than from the pure liquids, so the vapour pressure is higher than Raoult's law predicts. That happens when the attractions between unlike molecules (A-B) are weaker than those between like ones; mixing such liquids absorbs heat and increases the volume. Ethanol and acetone are a standard example.
Stronger A-B interactions give a negative deviation, and equal interactions give an ideal solution. The other options describe neither case correctly.
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