(D) Vapour pressure is an intensive property and is independent of the surface area of the liquid. It depends only on the nature of the liquid and the

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Assertion is false but Reason is true.

(D) Vapour pressure is an intensive property and is independent of the surface area of the liquid. It depends only on the nature of the liquid and the temperature. Therefore,the Assertion is false. However,the rate of vaporisation is indeed directly proportional to the surface area of the liquid,as more molecules are exposed to the surface to escape into the vapour phase. Therefore,the Reason is true.

Class 12 Chemistry Solutions Lowering of vapour pressure

Medium

Assertion $:-$ Vapour pressure of a liquid increases on increasing surface area.
Reason $:-$ Rate of vaporisation of a liquid is directly proportional to surface area.

A
Both Assertion and Reason are true and Reason is the correct explanation of Assertion.
B
Both Assertion and Reason are true but Reason is $NOT$ the correct explanation of Assertion.
C
Assertion is true but Reason is false.
D
Assertion is false but Reason is true.

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Lowering of vapour pressure

At a given temperature,the vapour pressure of a solution of two volatile liquids $A$ and $B$ is given by the equation $P_S = 120 - 80 \, X_B$ (where $X_B$ is the mole fraction of $B$). The vapour pressures of pure $A$ and $B$ at the same temperature are respectively:

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The mass of glucose that should be dissolved in $100 \ g$ of water in order to produce the same relative lowering of vapour pressure as is produced by dissolving $1 \ g$ of urea (molar mass $= 60 \ g/mol$) in $50 \ g$ of water is ........... $g$. (Assume dilute solution in both cases):-

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An open beaker of water in equilibrium with water vapour is in a sealed container. When a few grams of glucose are added to the beaker of water,the rate at which water molecules :

MediumJEE MAIN 2020

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$A$ solution is prepared by dissolving $68 \text{ g}$ of sucrose $(C_{12}H_{22}O_{11})$ in $1 \text{ kg}$ of water. Calculate the vapour pressure of the solution at $298 \text{ K}$. Given: Vapour pressure of pure water at $298 \text{ K} = 18 \text{ mm Hg}$ and mole fraction of solvent $(x_1)$ $= 0.9964$. (in $\text{ mm Hg}$)

DifficultMHT CET 2026

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Which of the following statements is incorrect?

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Assertion $:-$ Vapour pressure of a liquid increases on increasing surface area.Reason $:-$ Rate of vaporisation of a liquid is directly proportional to surface area.

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At a given temperature,the vapour pressure of a solution of two volatile liquids $A$ and $B$ is given by the equation $P_S = 120 - 80 \, X_B$ (where $X_B$ is the mole fraction of $B$). The vapour pressures of pure $A$ and $B$ at the same temperature are respectively:

The mass of glucose that should be dissolved in $100 \ g$ of water in order to produce the same relative lowering of vapour pressure as is produced by dissolving $1 \ g$ of urea (molar mass $= 60 \ g/mol$) in $50 \ g$ of water is ........... $g$. (Assume dilute solution in both cases):-

An open beaker of water in equilibrium with water vapour is in a sealed container. When a few grams of glucose are added to the beaker of water,the rate at which water molecules :

Which of the following statements is incorrect?

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Assertion $:-$ Vapour pressure of a liquid increases on increasing surface area.
Reason $:-$ Rate of vaporisation of a liquid is directly proportional to surface area.