Question

Difference between physisorption and chemisorption​

Answer 1

$\mathfrak{\huge{\green{Answer}}}$

◾️PHYSISORPTION

• In this type of adsorption, the adsorbate is attached to the surface of the adsorbent with weak van der Waal's forces of attraction.
• No new compound is formed in the process.
• It is generally found to be reversible in nature.
• Enthalpy of adsorption is low as weak van der Waal's forces of attraction are involved. The values lie in the range of 20-40 kJ mol - 1.
• It is favoured by low temperature conditions.

◾️CHEMISORPTION

• In this type of adsorption, strong chemical bonds are formed between the adsorbate and the surface of the adsorbent.
• New compounds are formed at the surface of the adsorbent.
• It is usually irreversible in nature.
• Enthalpy of adsorption is high as chemical bonds are formed. The values lie in the range of 40-400 kJ mol - 1.
• It is favoured by high temperature conditions.

$<marquee behavior="alternate">✌THANKS✌$

Answer 2

Physisorption :

(1)It arises because of van der waal's forces

(2) It requires very low or no activation energy

(3)Easily liquifiable gases are absorbed readily show chemisorption

(4) Enthalpy of adsorption is low (20-40kJ mol^-1)

(5) It decreases with the increase of temperature

(6) Activation energy is not needed

(7) It results into multimolecular layers on adsorbent surface

Chemisorption:

(1)It is caused by chemical bond formation

(2)It requires relativelyhigh activation energy

(3) Gases which can react with the adsorbent

(4) Enthalpy of adsorption is highly in this case

(5)It increase with the increase of temperature

(6) Some times high activation energy is needed

(7) It results into unimolecular

layer