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The vapour pressure of the solvent decre...

The vapour pressure of the solvent decreased by 10 mm of Hg 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 fraction of the solvent if a decrease in vapour pressure of 20 mm of Hg is desired:

A

0.6

B

0.8

C

0.4

D

0.2

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