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Column-I and Column-II contains four entries 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.
\begin{tabular}{ll}
\multicolumn{1}{c}{ Column-I } & Column-II \\
(A) Chemisorption & (P) Exothermic \\
(B) Physical adsorption & (Q) Endothermic \\
(C) Desorption & (R) Removal of adsorbed material \\
(D) Activation of adsorbent & (S) Highly specific in nature
\end{tabular}
(D) Activation of adsorbent
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