Can someone please tell me what …

In Chemisorption:With initial rise in temperature, the rate of adsorption increases but with further rise in temperature, after a certain limit, adsorption starts decreasing. This is because an initial rise in temperature will provide the molecules necessary activation energy for chemical bond formation so rate of adsorption increases. At a certain temperature all the bonds are formed and now the further increase in temperature will favourdesportion i.e., rate the adsorption now starts decreasing.

Chemical adsorption or Chemisorption: If the adsorbate molecules are bound to the surface of adsorbent by chemical bonds, the adsorption is known as chemical adsorption or chemisorption.

Effect of temperature: Even though chemical adsorption is an exothermic process, it does not occurs slowly at lower temperature due to high kinetic energy barrier. Hence, like most chemical changes, the extent of chemisorption increases with increase in temperature up to certain limit and then after that it starts decreasing.