Q.

An ideal solution has two components A and B. If A is more volatile than B and also PAo>PT, then the correct relation between mole fraction of A in liquid (X) and vapour (Y) phase is:

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XA=YA

XA>YA

None of the above

answer is C.

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Detailed Solution

According to Raoult's law,the partial pressure of a component of solution is equal to its mole fraction in the solution multiplied by its vapour pressure in pure state.Hence,PA=PAo XA ......(1) According to Dalton's law,the partial pressure of a component of a gas is, PA= PT YA .....(2) From 1 and 2PAoXA=PT.YABut ,PAo > PT Hence,XA< YA

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