Answer:
Gases which are liquefied more
easily generally consist of polar molecules e.g. \[HCl,\,\,N{{H}_{3}},\,\,S{{O}_{2}}\]
etc. This means that they have greater attraction towards the surface of the
adsorbent. These are adsorbed more readily on the surface of the adsorbent as
compared to gases like \[{{H}_{2}},\,He,\,{{N}_{2}}\] etc. which consist of
non-polar molecules that have comparatively lesser attraction towards the
surface of the adsorbent.
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