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Henry's Law

A beaker of w...

Question

A beaker of water is placed on a table. It can be made to boil quickly by passing

A

steam through it by atmosphere pressure

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B

steam through it at a pressure lower than atmospheric

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C

steam through it at a pressure higher than atmospheric

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D

hot water

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Solution

The correct option is B steam through it at a pressure lower than atmospheric
Steam has higher amount of heat and at low pressure, water boils quickly because it attains equilibrium pressure in less time.
So, a beaker of water is placed on a table. It can be made to boil quickly by passing steam through it at a pressure lower than atmospheric pressure.

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Similar questions

Q. Water can be boiled by passing steam through it.

(Assume Temperature of steam more than boiling point of water and pressure standard atmospheric pressure)

Q. Assertion: At

1 a t m

, pure water can boil at a temperature less than

273 K

.
Reason: Water boils when the vapor pressure of the water is equal to the atmospheric pressure.

Q. If the pressure is reduced from the atmospheric pressure to a lower pressure, water will boil at a temperature ____.

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:

1

: Water boils at a higher temperature on the moon.
Statement

2

: The atmospheric pressure of the moon is less than that on earth.

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