Q.

The vapour pressure of solvent is 20 torr, while that of its dilute solution is 17 torr, the mole-fraction of the solvent is

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0.6

0.85

0.5

0.7

answer is B.

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Detailed Solution

From question Po=20 torr,PS=17 torr∴ Po−PsPo=X solute320=X solute or X solute = 0.15X solvent = 1-0.15=0.85

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