MHT CET 2025 Chemistry question

Which from following mixtures exhibits positive deviation from Raoult's law?

(A)Ethanol and acetoneCorrect
(B)Benzene and toluene
(C)Chloroform and acetone
(D)Phenol and aniline

Answer: (A)

Solution

Positive deviation occurs when A-B interactions are weaker than A-A and B-B interactions, so the vapour pressure is higher than the Raoult's-law value (, ). In ethanol-acetone, acetone molecules break the hydrogen bonding of ethanol, so interactions weaken

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Question ID VK-102210