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In the case of chemisorption, why adsorp...

In the case of chemisorption, why adsorption first increases and then decreases with temperature?

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Chemisorption involves activation energy. The initial increase in chemisorption is due to the fact that the heat supplied acts as activation energy and more and more molecules of adsorbate gain energy and possess energy greater than activation energy. Therefore, adsorption increases with increase in temperature. Further increase will increase the energy of the molecules absorbed and will increase the rate of desorption. Therefore, extent of adsorption decreases.
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