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Standard X

Physics

Factors Affecting Boiling Point

Boiling point...

Question

Boiling point curve of a liquid at a particular pressure is given in the figure below:

Choose the correct boiling curve, when we decrease the pressure.

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None of these

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Solution

The correct option is C

The boiling point of a liquid decreases with the decrease in pressure. Hence, the correct option is 'C'.

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Similar questions

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 heating curve for ice initially at a particular pressure is given.

Choose the correct heating curve for the ice initially at $0^{\circ} C$ , if the pressure is decreased.

The boiling point of liquid decreases with _____ in pressure.

What will happen to the boiling point of a liquid, when we increase the 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:

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Boiling point curve of a liquid at a particular pressure is given in the figure below: Choose the correct boiling curve, when we decrease the pressure.

The correct option is C The boiling point of a liquid decreases with the decrease in pressure. Hence, the correct option is 'C'.

Boiling point curve of a liquid at a particular pressure is given in the figure below:

Choose the correct boiling curve, when we decrease the pressure.

The correct option is C

The boiling point of a liquid decreases with the decrease in pressure. Hence, the correct option is 'C'.