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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` . It forms an ideal solution with ‘B’ in which mole fraction of A is 0.8. If the vapour pressure of the solution is 84 mm of Hg at `25^(@)C`, the vapour pressure of pure 'B' at `25^(@)C` is :

A

56mm

B

70mm

C

140mm

D

28mm

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The correct Answer is:
C
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Vapour pressure of pure A is 70 mm of Hg at 25^(@)C . If it 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 25^(@)C , then the vapour pressure of pure B at 25^(@)C is

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