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Vapour pressure of pure 'A' is 70 mm of ...

Vapour pressure of pure 'A' is 70 mm of Hg at `25^@C`. If A forms an ideal solution with 'B' in which mole fraction of A is 0.8 and vapour pressure of the solution is 84 mm of Hg at

A

`25^@C`, then the vapour pressure of pure 'B' at `25^@C` is

B

140 mm

C

70 mm

D

56 mm

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