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Standard XII

Chemistry

Raoult's Law

Which of the ...

Question

Which of the following statements regarding a liquid is not correct?

The vapour pressure of a liquid increases with increase in temperature.

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The vapour pressure of a liquid decreases in the presence of a non-volatile impurity.

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The vapour pressure increases with decrease in temperature.

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At the normal boiling point, the vapour pressure of a liquid is 1 atm.

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Solution

The correct option is C The vapour pressure increases with decrease in temperature.
When a liquid is heated, it starts evaporating. So, more pressure is exerted because more molecules converts to vapour state.

So, the vapour pressure increases with the increase in temperature.

Option C is correct.

Suggest Corrections

Similar questions

The following are some statements about vapour pressure.

I. Vapour pressure of a solution increases with increase in temperature.

II. Liquids with high vapour pressure even at ordinary temperatures are volatile liquids.

III. The temperature at which vapour pressure of solution is equal to atmospheric pressure is called boiling point.

IV. When a non-volatile solute is dissolved in a volatile solvent, its vapour pressure decreases.

Which of the above is/are correct?

Vapour pressure of a liquid decreases with increase in:

Comprehension # 2

Following passage explains the effect of temperature on the vapour pressure of the liquid.

Effect of temperature on vapour pressure

The quantity of heat required to evaporate a given liquid at constant temperature is defined as the heat of vaporisation. Variation of vapour pressure with temperature is given by,

Clausius-Clapeyron equation.

l o g_{e} P = - \frac{Δ H_{v a p}}{R T} + l o g_{e} A

A liquid is said to be at its boiling temperature if its vapour pressure is equal to external pressure. Therefore, the boiling point of water in particular and of liquids in general decreases as an altitude of a place increases where the external pressure is less than

1 a t m o s p h e r e

(normal b.p. of water is

373.15 K

1 a t m o s p h e r e

)

On top of mount everest, for example, where the atmospheric pressure is only about

260 m m H g

, water boils at approximately

71^{\circ} C

. Conversely, if the external pressure on a liquid is greater than

1 a t m

, the vapour pressure necessary for boiling than normal boiling is reached later, and the liquid boils at a temperature greater than the normal boiling point.

Clausius-Clapeyron equation can be written in the following form:

Based on the statements given here choose the correct answer.
(1) Boiling point of a liquid increases with increase in temperature.
(2) The volume of liquids increases on boiling and the vaporisation curve shows the variation of the boiling point of a liquid with pressure and expands the equilibrium state between liquid and vapour phase.

Q. The normal boiling point of a liquid is that temperature at which vapour pressure of the liquid is equal to:

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Which of the following statements regarding a liquid is not correct?

The correct option is C The vapour pressure increases with decrease in temperature.When a liquid is heated, it starts evaporating. So, more pressure is exerted because more molecules converts to vapour state. So, the vapour pressure increases with the increase in temperature.Option C is correct.