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Raoult's Law

Two liquids A...

Question

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 form an ideal solution and the ratio of the mole fractions 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

\frac{1}{5}

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B

\frac{2}{3}

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C

\frac{4}{5}

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D

\frac{1}{4}

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Solution

The correct option is A $\frac{1}{5}$

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