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Standard XII

Chemistry

Liquefaction of Gases and Critical Constants

The critical ...

Question

The critical temperature of a gas is the temperature:

above which it can no longer remain in the gaseous state

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above which it cannot be liquefied by pressure

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at which it solidifies

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at which the volume of the gas becomes zero

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Solution

The correct option is B above which it cannot be liquefied by pressure
The critical temperature of a gas is that temperature above which it cannot be liquefied by pressure. It is the highest temperature at which gaseous state starts condensation into liquid state. It is represented as $T_{c}$ . For example, the critical temperature of carbon dioxide gas is 30.98 deg C.

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Similar questions

The essential conditions for liquefaction of gases were discovered by Andrews in

1869

as a result of his study of pressure-volume-temperature relationship for

C O_{2}

. It was found that above a certain temperature, it was impossible to liquefy a gas whatever the pressure was applied. The temperature below which the gas can be liquefied by the application of pressure alone is called critical temperature

(T_{c})

. The pressure required to liquefy a gas at this temperature is called the critical pressure

(P_{c)}

. The volume occupied by one mole of the substance at the critical temperature and pressure is called critical volume. Critical constants are related with van der Waals' constant as follows:

V_{c} = 3 b, P_{c} = \frac{a}{27 b^{2}}, T_{c} = \frac{8 a}{27 R b}

Which of the following parameters is three times the van der Waals' constant

^{'} b^{'}

State True or False.

A gas above its

T_{c}

or its critical temperature can be liquefied.

Q. The temperature to which a gas must be cooled before it can be liquefied by pressure alone is called its

The essential conditions for liquefaction of gases were discovered by Andrews in

1869

as a result of his study of pressure-volume-temperature relationship for

C O_{2}

(T_{c})

. The pressure required to liquefy a gas at this temperature is called the critical pressure

(P_{c)}

. The volume occupied by one mole of the substance at the critical temperature and pressure is called critical volume. Critical constants are related with van der Waals' constant as follows:

V_{c} = 3 b, P_{c} = \frac{a}{27 b^{2}}, T_{c} = \frac{8 a}{27 R b}

The relationship between

P_{C}, V_{C}

and

T_{C}

Consider the following statements.

I. Gaseous substances whose critical temperatures are above room temperatures can be liquefied by applying sufficient pressure to the gas.

II. Gaseous substances whose critical temperatures are below room temperature can be liquefied by the application of pressure and lowering of temperature below $T_{c}$ .

Select the correct alternate.

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