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What is physical adsorption ? Give three...

What is physical adsorption ? Give three characteristics.

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When the particles of the adsorbate are held to the surface of the adsorbent by weak van der Waals forces, the adsorption is called physical adsorption or physisorption.
Characteristics :
(i) It is not specific in nature. (ii) It is reversible in nature.
(iii) Adsorption decreases as temperature increases.
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