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Question

Considering the formation, breaking and strength of hydrogen bond, predict which of the following mixtures will show a positive deviation from Raout's law?

A
Methanol and acetone
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B
Chloroform and acetone
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C
Nitric acid and water
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D
Phenol and aniline
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Solution

The correct option is B Methanol and acetone

A mixture of methanol and acetone shows positive deviation from Raoult's Law. Pure methanol possesses hydrogen bonding. Introduction of acetone between the molecules of methanol results in breaking of some of these hydrogen bonds. Due to weakening of interactions, the solution shows positive deviation from Raoult's law.


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