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Two liquids A and B have vapour pressure...

Two liquids A and B have vapour pressure in the ratio `P_(A)^(0):P_(B)^(0)=1:3` at a certain temperature . Assume A and B from an ideal solution and the ratio of mole fraction of A to B in the vapour phase is `4:3` . Then the mole fraction of B in the solution at the same temperature is :

A

`1//5`

B

`2//3`

C

`4//5`

D

`1//4`

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The correct Answer is:
A
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