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