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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

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(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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