Chemistry (M.Phil./Ph.D.) 2015 Panjab University Entrance Exam With Answers

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33.

The vapour pressure of pure liquid solvent A is 0.80 atm. When a non volatile substance B is added to the solvent, its vapour pressure drops to 0.60 atm. What is the mole fraction of component B in solvent ?

A: 0.75
B: 0.50
C: 0.25
D: 1.0

The answer is: C

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