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Liquids in Liquids

Which of the ...

Question

Which of the following is not a property of liquid state?

A

Intermolecular force of attraction in a liquid is quite large.

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B

All liquids accompanied by cooling on evaporation.

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C

Lower the boiling point of a liquid, greater is its vapour pressure at room temperature.

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D

A liquid boils at higher temperature at the top of a mountain than at the sea level.

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Solution

The correct option is D A liquid boils at higher temperature at the top of a mountain than at the sea level.
The option (D) is not a property of the liquid state.
A liquid boils at lower temperature at the top of a mountain than at the sea level.
This is because the pressure at the top of a mountain is lower than that at the sea level.
This lowers the boiling point of the liquid.

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Q. Assertion :Liquid boils at a lower temperature at the top of a mountain than at sea level. Reason: This is because the pressure at the top of a mountain is low.

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:

The boiling point of a liquid is that temperature at which the vapour pressure of the liquid is

Q. The phenomenon of changing liquid into vapours at a temperature its boiling point is called evaporation.

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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