1.

Distinguish between adsorption and absorption.

Answer»
S. NoAdsorptionAbsorption
(i)It is a surface phenomenon i.e., occurs only at the surface of the adsorbent.It is bulk phenomenon i.e., occurs throughout the body of the material.   
(ii)Concentration of the adsorbate at the adsorbent surface is more than in the bulk.Absorbed material is uniformly distributed throughout the bulk. Concentration is same throughout.
(iii)Rate of adsorption is rapid initially and decreases later.Absorption occurs with uniform rate.
(iv)Example: Water vapour on silica gel.Example: Water vapours are absorbed by anhydrous CaCl2 .


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