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The vapour pressure of a solvent A ...

The vapour pressure of a solvent A is 0.80 atm. When a non-volatile substance B is added to this solvent Its vapour pressure drops to 0.6 atm what is the mole fraction of B in solution ?

A

`0.25`

B

`0.50`

C

`0.75`

D

`0.90`

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The correct Answer is:
A
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