Q31 / 155 · WBJEE 2022 · Chemistry

Pick the correct statement.

Correct answer
A
Relative lowering of vapour pressure is independent of $\mathrm{T}$.
B
Osmotic pressure always depends on the nature of solute.
C
Elevation of boiling point is independent of nature of the solvent.
D
Lowering of freezing point is proportional to the molar concentration of solute.

Solution

Relative lowering of vapour pressure is $\frac{\Delta \mathrm{P}}{\mathrm{P}^{\circ}}$, which is equal to mole fraction of solute which is independent of temperature.

Hence, the correct answer is option: 'A'.

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