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

The vapour pressure of pure liquid 'A' is 70 torr, at `27^(@)C`. It forms an ideal solution with another liquid 'B'. The mole fraction of 'B' is 0.2 and total pressure of the solution is 84 torr at `27^(@)C`. Find the vapour pressure of pure liquid B at `27^(@)C`.

A

14

B

56

C

140

D

70

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The correct Answer is:
C
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