Column - I and Column - II contains four emtries each. Entries of Column -I are to be matched with some entries of Column - II . One or more than one entries of Column -I may have the matching with the same entries of Column - II. `{:("column-I","column-II"),((A)" Chemisorption",(P)" Exothermic"),((B)" Physical adsorption",(Q)" Endoothermic
"),((C)" Desorption",(R)" Removal of adsorbed material"),((D)" Activation of adsorbent",(S)" Highly specific in nature"):}`
