Q. Which of the following is incorrect?
A) Relative lowering of vapour pressure is independent of the solute and the solvent.
B) The relative lowering of vapour pressure is a colligative property.
C) Vapour pressure of a solution is lower than the vapour pressure of the solvent.
D) The relative lowering of vapour pressure is directly proportional to the original pressure.
Explanation
(d)
According to Raoult’s law the relative lowering of vapour pressure of a dilute solution is equal to the mole fraction of the solute present in the solution, i.e.,
$\frac{p - p_{s}}{p} = \frac{n}{n + N}$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.