Q.

Which of the following liquid pairs shows a positive deviation from Raoults Law ?

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a

Water - hydrochloric acid

b

Benzene - Methanol

c

Water - Nitric acid

d

Acetone-chloroform

answer is B.

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Detailed Solution

The hydrogen bonds between CH3OH molecules are disturbed by C6H6 molecules A-B ( CH3OH - C6H6 ) interactions are weaker than A-A (CH3OH - CH3OH) and B-B (C6H6 - C6H6 )attractions.The mixture shows +ve deviation from Raoult's law
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