Water and chlorobenzene are immiscible liquids. Their mixture boils at 89oC under a reduced pressure of 7.7 x 104 Pa. The vapour pressure of pure water at 89oC is 7 x 104 pa. Weight per cent of chlorobenzene in the distillate is :

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78.3

38.46

answer is D.

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Detailed Solution

WAWB=PA⊙PB∘×MAMB⇒0.77×112.518⇒0.625%WAWA+WB×100=0.6251.625×100⇒38.46

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