Adsorption is spontaneous process and involves
unequal distribution of the molecules of the gaseous
substance on the surface solid or liquid. Adsorption is
exothermic process. The attractive forces between
adsorbate and adsorbent are either van der Wall forces
or chemical bonds. Adsorption of gases on solids is
generally controlled by the factors like temperature,
pressure and nature of adsorbate and adsorbent.
(i) In physisorption process the attractive forces between adsorbate and adsorbent are –
Text Solution
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(i)
Sol. Van der Wall forces
(ii)
Sol. The extent of adsorption is generally related to ease of liquefaction of gases
(iii)
Sol. x/m = 
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