a) ‘Adsorption’ has many applications. Write any two applications of adsorption. b) Physisorption and chemisorption are two types

Question

a) ‘Adsorption’ has many applications. Write any two applications of adsorption. 

b) Physisorption and chemisorption are the two types of adsorption. Write any four dierences between them.

Answer 1

a) 1) In production of high vacuum 

2) In gas masks 

b)

Physical Adsorption	Chemical Adsorption
1) Adsorbate mole - cules are held on the surface of the adsor bent by weak van der Waals’ forces	1) The adsorbate mole cules are held on the surface of the adsor bent by chemical bonds
2) Not specific in nature	2) Highly specific in nature
3) Low temperature is favourable for adsorption	3)High - temperature is favourable for adsorption
4) Enthalpy of adsorption is low (20-40 kJ mol-1)	4) Enthalpy of adsoption is high (80-240 kJ mol-1)