Two liquids A and B have PA∘ and PB∘ in the ratio of 1 : 3 and the ratio of number of moles of A and B in liquid phase are 1 : 3 then mole fraction of ? in vapour phase in equilibrium with the solution is equal to:

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0.1

0.2

0.5

1.0

answer is A.

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Detailed Solution

xA=11+3⇒14; xB=34 yAyB=PA∘PB∘×xAxByA1−yA=13×13 ⇒19 or yA=110

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