Enthalpy of adsorption is in the range of 80-240 kJ $\mathrm{mol}^{-1}$
Solution
Chemisorption:
(i) It is highly specific in nature.
(ii) It is irreversible
(iii) It result into unimolecular layer.
(iv) Enthalpy of adsorption is high ( $80-240 \mathrm{~K}$ )
(v) It is caused by chemical bond formation.