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At 300 K , when a solute is aded to a...

At 300 K , when a solute is aded to a solvent ,its vapour pressure over mercury reduces from 50 mm to 45 mm . The value of mole fraction of solute wil be _____.

A

`0.005`

B

`0.01`

C

`0.1`

D

`0.9`

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The correct Answer is:
C
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