Published by:
CGP EDU Academic Team
Published on: August 14, 2026
The vapour pressure of a solvent decreased by 10 mm ofmercury when a non ‐ volatile solute was added to the solvent. The mole fraction ofthe 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?
Text Solution
Verified by ExpertsThe correct answer is:
B
(mole fraction of solute) 
From Raoult’s law,
mm
Again, when 
mm, then
20
mole fr action of solute 
50
mole fraction of solvent 
Prepare Smarter with CGP Edu
Get practice questions, solutions, and test series in one place.
Write a Review
Share your experience with this question and solution.
Commentary
Send your comment, doubt, correction, or feedback to admin.
Similar Questions
Explore conceptually related problems
If molality of the dilute solution is doubled, the value of molal depression constant ( K ) will be
Which of the following is dependent on temperature?
The Van’t Hoff factor ( i ) for a dilute aqueous solution of the strong electrolyte barium hydroxid…
Which one of the following is incorrect for ideal solution?
Which of the following statements about the composition of the vapour over an ideal 1 : 1 molar mix…
At the vapour pressure of a solution of 6.5 of a solute in 100 water is 732 mm. If , the boilin…