Q .     The vapour pressure of a solvent decreased by `10 mm` of mercury when a non-volatile solute was added to the solvent. The mole fraction of the solute in the solution is `0.2`. What should be the mole fraction of the solvent if the decrease in the vapour pressure is to be `20 mm` of mercury?

AIPMT 1998
A

`0.4`

B

`0.6`

C

`0.8`

D

`0.2`

0
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