Q.

Which of the following shows negative deviation from Raoult's law?

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a

CHCl3 and CH3COCH3

b

CHCl3 and C2H5OH

c

C6H5CH3 and C6H6

d

C6H6 and CCl4

answer is A.

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Detailed Solution

CHCl3+CH3COCH3When acetone and chloroform are mixed together a hydrogen bond is formed between them which increases the inter molecular attraction between them and hence decreases the vapour pressure.That is experimental vapour pressure is less than the vapour pressure calculated by using the Raoult's law.
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