Answer:
Critical temperature may be defined
as the minimum temperature above which a gas cannot be liquefied however large
its pressure may be. It may be noted that greater the critical temperature,
easier will be the ease of liquefication of the gas and more will be its extent
of adsorption on a particular solid such as activated charcoal. Therefore the increasing
order of the extent of adsorption is:
\[{{N}_{2}}<CO<C{{H}_{4}}\]
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