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NEET levelSingle correct optionDifficulty 1 of 3so038

For a solution of a non-volatile solute, the relative lowering of vapour pressure $(p^{0} - p) / p^{0}$ is equal to

Athe mole fraction of the solute
Bthe mole fraction of the solvent
Cthe molality of the solute
Dthe molarity of the solute

Answer: A

By Raoult's law

p = x_{1} p^{0}

, so

(p^{0} - p) / p^{0} = 1 - x_{1} = x_{2}

, the mole fraction of the solute. It is dimensionless, unlike molality or molarity.

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