Q. Relative lowering of vapour pressure of a dilute solution is 0.2. What is the mole fraction of the non-volatile solute ?
A) 0.8
B) 0.5
C) 0.3
D) 0.2
Explanation
(d)
According to Raoult’s law the relative lowering in vapour pressure of an ideal solution containing the non-volatile solute is equal to the mole fraction of the solute.
$\because\ \$Relative lowering of vapour pressure =0.2
$\therefore$ Mole fraction of the solute =0.2
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.