Physical adsorption is multilayered while chemisorption is monolayered.Why ?

Explanation

In physical adsorption, the bonding between adsorbent and adsorbate is weak van der Waal.s bonding which is due to electrostatic forces of attraction between opposits charges. As such multimolecular layers are possible. No doubt the second, third layers of adsorbate will be less tightly held by the adsorbent than the first layer. In chemical adsorption the adsorbate is held on the surface of adsorbent by chemical bonds. Once all the bonds on the surface of adsorbent are used for chemical bonding, no further adsorption is possible. Hence in chemical adsorption only one layer of adsorbate is formed in the adsorbent i.e., chemical adsorption is monolayered.