Solutions Question 130

Question: The vapour pressure of a solvent decreased by 10mm 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 decrease in the vapour pressure is to be 20,mm of mercury [CBSE PMT 1998]

Options:

A) 0.8

B) 0.6

C) 0.4

D) 0.2

Show Answer

Answer:

Correct Answer: B

Solution:

\ P0Ps=P0×mole ,fraction, solute

10=P0×0.2 ; 20=P0×n
Þ n=0.4 \ N=0.6 .



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