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Adsorption is always exothermic in nature. Explain

Answer»

According to thermodynamics, ΔG = ΔH - T.ΔS  . Adsorption is a spontaneous process, therefore ΔG is negative since adsorption decreases entropy ( ΔS = –ve ). i.e., –T. ΔS = + ve . As a result of adsorption. ΔH has to be negative if ΔG to be negative. Hence adsorption is always exothermic. 



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