Question

Write three differences between Physisorption and Chemisorption.

Answer 1

S.No.	Physisorption	Chemisorption
1.	The absorbate molecules are held to the surface of an absorbent by weak van Der Waal's forces.	The absorbate molecules are held to the surface of an absorbent by chemical bonds.
2.	It is generally non-specific in nature, i.e., it does not depend on the nature of the absorbate and absorbent.	It is highly specific in nature, i.e., it depends on the nature of the absorbate and absorbent.
3.	It possesses a low enthalpy of adsorption in order of 20 kJ/mol.	It possesses a high enthalpy of adsorption order of 200 kJ/mol.