An ideal solution has equal mol-fractions of two volatile components A and B. In the vapour above the solution, the mol-fractions of A and B:

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Are both 0.50

Are equal but not necessarily 0.50

Are not very likely to be equal

Are 1.00 and 0.00 respectively

answer is B.

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Detailed Solution

Mole fraction in vapour phase also depend upon volatility of A and B i.e. PA0 and PB0

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