MEDIUMMCQ SINGLEJEE Mains ChemistryPhysical ChemistrySolutionsRaoult’s law
The vapour pressures of two liquids A and B in their pure states are in the ratio of 1: 2. A binary solution of A and B contains A and B in the mole proportion of 1: 2. The mole fraction of A in the vapour phase of the solution will be:
A.0.33
B.0.25
C.0.52
D.0.2✓ Correct
Explanation
1 2 A B P P Let A P =1 & B P =2 As per Raoult’s law 1 1 1 3 3 2 4 2 3 3 1 1 4 3 3 3 1/ 3 1 0.2 5/ 3 5 A A A B B B A A T A A P X P P X P P X P X X x x x x Ideal and non-ideal solution
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