Question

The correct opion(s) related to adsorption process is (are) 

(A) Chemisorption results in unimolecular layer. 

(B) The enthalpy change during physisorption is in the range of 100 to 140 kJ mol^-1 

(C) Chemisorption is an endothermic process 

(D) Lowering the temperature favours physisorption process

Answer 1

(A) Chemisorption results in unimolecular layer. 

(D) Lowering the temperature favours physisorption process

→ Chemisorption is unimolecular layer and exothermic. 

→ The enthalpy change in physiorption is 20 – 40 kJ/mol. 

→ Physiorption decreases with increase of temperature.