The vapour presure of a pure liquid 'A'...

The vapour presure of a pure liquid 'A' is 70 torr at `27^@C`. It forms an ideal solutons with another liquid B. the mole fraction of B in the solutin is 0.2 and total pressure of solution is 84 torr at `27^@C`. The vapour pressure of pure liquid is B at `27^@C`:

14 torr

56 torr

140 torr

70 torr

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