Question

The heat of adsorption in physisorption lie in the range ($kJ/mol$):

• A. $20-40$
• B. $40-80$
• C. $10-20$
• D. $1-10$

Answer 1

The correct option is A $20-40$

Physical adsorption involves weak forces of attraction between adsorbate and adsorbent molecules.

Thus, it requires less heat for adsorption (i.e. between 20 - 40 KJ/mol).