Physisorption | Chemisorption |
It involves physical forces (van der Waals forces) between the particles of adsorbate and adsorbent. | It involves chemical bonds (covalent bonds) between the particles of adsorbate and adsorbent. |
It is not specific in nature. It may be found in all instances. | It is highly specific in nature. It occurs only if there is tendency to form a chemical bond. |