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

The vapour pressure of a pure liquid 'A' is 60mm, at `25^@C`. It forms an ideal solution with another liquid 'B'. The mole fraction of 'B' is 0.6 and the total Pressure is 64mm. Then the vapour pressure of 'B' at `25^@C` is

66.6 mm

75 mm

52 mm

120 mm

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