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

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By Expert Faculty of Sri Chaitanya
a
water - hydrochloric acid
b
Acetone - Chloroform
c
water - nitric acid
d
Benzene - methanol

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detailed solution

Correct option is D

Benzene (non polar) and CH3OH  (polar). Intermolecular interaction between then in solution is  weak.


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At 25oC  vapour pressure of  a volatile liquid A is 60 torr. To 4 mol of A, x moles of another volatile liquid B is added at 25oC . The vapour pressure of the resulting solution was found to be 72 torr and mole fraction of A in the vapour phase was 1/3. The value of x is

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