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The vapour pressure of pure liquid Ais 7...

The vapour pressure of pure liquid Ais 70 torr at `27^@C` It forms an ideal solution with another liquid B. The mole fraction of B 1s 0.2 and total vapour pressure of the solution is 84 torr at `27^@C`. The vapour pressure of pure liquid B at `27^@C` is

A

140 torr

B

50 torr

C

14 torr

D

70 torr

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