What are different types of adsorption? Give any three differences between characteristics of these different types of adsorption.

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Solution

The different types of adsorption are Physisorption and Chemisorption.
The differences between characteristics are given below.
Physisorption Chemisorption
It involves physical or van der Waals forces between the particles of adsorbate and adsorbent.
It involves chemical bonds (covalent bonds) between adsorbate and adsorbent particles.
It has low heat of adsorption (20 to 40 kJ/mol)
It has high heat of adsorption (40 to 200 kJ/mol)
It is relatively weak.
It is relatively strong.
Adsorption is multilayer.
Adsorption is monolayer.

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Physisorption	Chemisorption
It involves physical or van der Waals forces between the particles of adsorbate and adsorbent.	It involves chemical bonds (covalent bonds) between adsorbate and adsorbent particles.
It has low heat of adsorption (20 to 40 kJ/mol)	It has high heat of adsorption (40 to 200 kJ/mol)
It is relatively weak.	It is relatively strong.
Adsorption is multilayer.	Adsorption is monolayer.