Which among the following gases can be liquified easily?
Nitrogen
Chlorine
Hydrogen
Oxygen
A
Oxygen
B
Chlorine
C
Nitrogen
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 Cl2,NH3,CO2,SO2 etc.,) can be liquified by applying a suitable pressure alone.
Permanent gases (such as H2,N2,O2 etc.,) cannot be liquified by the action of pressure and cooling.
Hence, option A is correct.
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