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Standard XII

Chemistry

Liquefaction of Gases and Critical Constants

Under what co...

Question

Under what conditions, can a gas be cooled and converted into liquid?

At its critical temperature by decreasing pressure on it

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Above its critical temperature by increasing pressure on it

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Above its critical temperature by decreasing pressure on it

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Below its critical temperature by increasing pressure on it

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Solution

The correct option is C Below its critical temperature by increasing pressure on it
When gas is cooled till its critical temperature, the gas state starts converting into a liquid state.
Above this temperature, the gas state will exist and below this temperature, the liquid state will exist.
As the pressure increases above the critical temperature, more and more compression of liquid takes place.

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Similar questions

Q. A gas can be liquified by pressure alone only, when its temperature is ___________ its critical temperature.

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}

The relationship between

P_{C}, V_{C}

and

T_{C}

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}

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

^{'} b^{'}

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.

Q. At constant temperature on increasing the pressure of a gas by 5% will decrease its volume by

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