defference between physical adsorption and chemical adsorption
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Physical absorption occurs when the adsorbate gas molecules are held by physical forces like Van der Waals forces. Chemical adsorption occurs when the absorbate molecule is held on the adsorbent surface by chemical forces as short covalent chemical bonding occurs by the sharing of electrons.
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- Physical adsorption:
* Weak van der Waals forces are present between adsorbate and adsorbent.
* It has low heat of adsorption (20 to 40 kJ/mol).
* Multilayers of adsorbed particles are formed.
* It is not specific in nature.
- Chemical adsorption
* Strong chemical (covalent) bonds are formed between adsorbate and adsorbent.
* It has high heat of adsorption (40 to 200 kJ/mol).
* Monolayer of adsorbed particles is formed.
* It is specific in nature.
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