Two liquids A and B have vapour pressure...

Two liquids A and B have vapour pressure in the ratio `P_A^@:P_B^@`=2:3 at a certain temperature. Assume A and B form an ideal solution and the ratio of mole fractions of A to B in the vapour phase in 1:3,then the mole fraction of A in the solution at the same temperature is :

1/3

2/3

1/4

3/4

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