Differentiation between Physical and Chemical Adsorption

1. Heat of adsorption is greater than 80 kilo joules per mole.
2. This adsorption mostly occurs at high temperature.
3. Chemisorption     is        highly
   specific.
4. It depends both on adsorbate and adsorbant.
5. It is irreversible in nature.
6. Chemisorption decreases with the increase of pressure of the adsorbate.

1. Heat of adsorption is less then 40 kilo joules per mole.
2.  This adsorption mostly occurs at low temperature.
3. Physical adsorption is not specific.
4. It depends only on the adsorbate.

5 . It is reversible in nature.

6. The extent of physical

adsorption increases with increase of pressure of the adsorbate.