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Standard XII

Physics

Area and Volume Expansion

A gaseous com...

Question

A gaseous compound is heated at constant pressure. The figure above shows the variation of volume as the temperature is increased.
At first, the volume increases in a steady fashion, as predicted by Charles' law. Then, all of a sudden, at Point A, the volume starts to increase at a more rapid rate.
Which of the choices is a possible explanation for this behavior?

Gases cease to behave ideally at elevated temperature.

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The molecules of gas have begun to dissociate.

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Point A is the critical point for this substance.

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A change of state is occurring.

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Solution

The correct option is C Point A is the critical point for this substance.
At point A their is sudden increase in volume with small increase in temperature, at point A, substance is converting into liquid state from solid state.Hence, point A is known as critical point.

Option (C) is correct.

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Similar questions

The variation of pressure with volume of the gas at different temperatures can be graphically represented as shown in figure. On the basis of this graph answer the following questions.

(i) How will the volume of a gas change if its presuure is increased at constant temperature?

(ii) At a constant pressure, how will the volume of a gas change if the temperature is increased from 200 K to 400 K?

Consider the following statements:

(I) An increase in pressure (caused by decrease in volume) at equilibrium results in increase in molar concentration of each gaseous substance involved.

(II) An increase in pressure (caused by decrease in volume) at equilibrium results in increase in no. of moles of each gaseous substance involved.

(III) For the reaction

A (s) ⇌ B (g) + C (g)

at constant temperature, total pressure at equilibrium (of

B (g)

C (g)

) is not affected by changing the volume of container.

(IV)

H_{2} O (l) ⇌ H_{2} O (g)

on temperature increase,

K_{p}

of this reaction is increased.

Tick the correct statement(s)

Q. A perfect gas at

27^{0} C

is heated at constant pressure so as to double its volume. The increase in temperature of the gas will be

Q. The figure shows the variation of specific heat capacity (C) of a solid as a function of temperature (T). The temperature is increased continuously from

0 t o 500 K

at a constant rate. Ignoring any volume change, the following statement(s) is (are) correct to a reasonable approximation.

At 27 $^{0}$ C certain gas occupied a volume of 4 litres. If the volume of this is to be increased to 12 litres at the same pressure, the gas is to be heated to a temperature

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The correct option is C Point A is the critical point for this substance.At point A their is sudden increase in volume with small increase in temperature, at point A, substance is converting into liquid state from solid state.Hence, point A is known as critical point.Option (C) is correct.

The correct option is C Point A is the critical point for this substance.
At point A their is sudden increase in volume with small increase in temperature, at point A, substance is converting into liquid state from solid state.Hence, point A is known as critical point.

Option (C) is correct.