Question

Which of the following is incorrect?

• A. Relative lowering of vapour pressure is independent of the nature of the solute and the solvent
• B. The ralative lowering of vapour pressure its 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

Answer 1

Answer: (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-ps}{p}=\frac{n}{n+N} $