Answer:
Both physical and chemical
adsorption are of exothermic nature. The extent of adsorption is likely to
decrease with rise in temperature. However, in chemical adsorption, the bonds
present in the reactant species are to cleave initially and this is followed by
adsorption. Since bond cleavage requires some energy, the chemical adsorption initially
increases with rise in temperature and then decreases. Physical adsorption
however, decreases with rise in temperature. For details consult Section 5.5.
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