The pV-curve shown represents a solution exhibiting **negative** deviation from Raoult's law. Which mixture is an example of this behaviour? 
AAir (oxygen + nitrogen)
BEthanol + acetone
CCarbon disulphide + acetone
DChloroform + acetone
Answer & Solution
Correct answer: D. Chloroform + acetone
Negative deviation: solute–solvent interactions are **stronger** than like-like. Chloroform + acetone form a hydrogen bond between the C–H of CHCl₃ and the carbonyl O of acetone, holding molecules tighter and lowering escape rate — vapour pressure dips below Raoult. Phenol + aniline is the other classic example. Ethanol + acetone shows positive deviation.
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