Why do physisorption and chemisorption behave differently with rise in temperature ?

Explanation

Physisorption involves weak van der Walls' forces. The magnitude of these forces decreases with rice in temperature. The chemisorption involves formation of chemicl bonds between the molecules of adsprbae and adsorbent. This require activation energy which is supplied with rice in temperature. Therefore, chemisorption increases as the temperature increases. However, one the desired activation energy has been supplied, the further rise in temperature decreases extent of adsorption Please note that both these types of adsorption are of exothermic nature.