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Liquid A(P(A)^(0)=100mm Hg) and liquid B...

Liquid `A(P_(A)^(0)=100mm Hg)` and liquid `B(P_(B)^(0)=400mmHg)` from an ideal solution. At equilibrium vapour contains 20% molecules of A.
The mole fraction of B in liquid phase is

A

`0.25`

B

`0.5`

C

`0.75`

D

`0.675`

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