Question

What is the effect of temperature on chemisorption?

Answer 1

Hint: Chemisorption is the process of adsorption in which the gas molecules or atoms are held to the surface by chemical bonds. The chemical bonds may be covalent or ionic in nature. Examples include adsorption of nitrogen or hydrogen on the surface of the Fe catalyst.

Complete step-by-step answer:
 Effect of temperature:- Chemisorption involves the formation of chemical bonds. Even though chemical adsorption is an exothermic process, it does not occur slowly at lower temperatures due to the high kinetic energy barrier as the activation energy increases.
 Hence, like most chemical changes, the extent of chemisorption increases with an increase in temperature up to a certain limit and then after that, it starts decreasing as further high temperature helps in breaking the bonds between the adsorbed molecules and the adsorbate.

Additional Information:
Accumulation of molecular species on the surface rather than in the bulk of solid or liquid is termed as adsorption. i.e. When different molecular species get accumulated on the surface rather than in bulk that is inside a solid or liquid is termed as adsorption.
Adsorbate-The substances that get adsorbed on the solid surface due to intermolecular attractions.
Adsorbent-The solid substance on the surface of which adsorption occurs is known as adsorbent.

Note: The possibility to make a mistake is that chemisorption increases as the temperature increases but after a certain limit the chemisorption will decrease.