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(C) Chemical adsorption (chemisorption) occurs when adsorbate molecules are held to the adsorbent surface by chemical forces. Effect of temperature: $

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$a$ and $c$ represent chemisorption

Vedclass · Answer

(C) Chemical adsorption (chemisorption) occurs when adsorbate molecules are held to the adsorbent surface by chemical forces. Effect of temperature: $1$. Physical adsorption (physisorption) involves weak van der Waals forces and is exothermic. According to Le Chatelier's principle,an increase in temperature favors desorption,so physisorption decreases continuously with increasing temperature. Plot $(b)$ represents physisorption. $2$. Chemisorption involves the formation of chemical bonds and typically requires an activation energy. Therefore,it increases initially with temperature,shows a maximum,and then decreases. Plot $(a)$ represents this behavior. $3$. Plot $(c)$ shows the potential energy profile for chemisorption,where the high activation energy (indicated by $150 \ kJ \ mol^{-1}$) is characteristic of chemical bond formation. Thus,plots $(a)$ and $(c)$ represent chemisorption.

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