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Explain why a solution of chloroform and...

Explain why a solution of chloroform and acetone shows negative deviation from Raoult's law.

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Chloroform and acetone show attractive by formation of a hydrogen bond :

The attractive forces between molecules of chloroform and acetone are stronger than those between the molecules of chloroform and between the molecules of acetone. Thus less molecules leave the surface of the solution. This causes negative deviation from Raoult.s law. The vapour pressure observed will be smaller than expected.
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