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Question

Which among the following gases can be liquified easily?

A

Chlorine

B

Nitrogen

C

Oxygen

D

Hydrogen

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Solution

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A gas can be liquified when its temperature is below the critical temperature, by cooling or compressing it.

Gases which have high critical temperatures (such as ${C l}_{2}, N H_{3}, C O_{2}, S O_{2}$ etc.,) can be liquified by applying a suitable pressure alone.

Permanent gases (such as $H_{2}, N_{2}, O_{2}$ etc.,) cannot be liquified by the action of pressure and cooling.

Hence, option A is correct.

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