Why in case of chemical adsorption, adsorption first increases and then decreaes?
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Chemisorption involves a high activation energy,so also reffered to as activated adsorption.It is found in chemisorption that it first increases and than decreases with increase in temperature.When adsorption isobar is plotted the graph first increases and than decreases with T.The initial increase is due to the heat
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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. ... Therefore, the extent of adsorption decreases.
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