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Boiling

The normal bo...

Question

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

A

Zero

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B

380 mm of Hg

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C

760 mm of Hg

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D

100 mm of Hg

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Solution

The correct option is C
760 mm of Hg

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Similar questions

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

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

Q. Assertion :The normal boiling point of water is

100^{\circ} C

and standard boiling point of water is

{99.6}^{\circ} C

. Reason: The temperature at which vapour pressure of liquid is equal to the external pressure is called boiling temperature at that pressure.

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:

Q. The vapour pressure of a liquid at its boiling point is equal to ___ atm.

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