Question

Differentiate between physisorption and chemisorption.

Answer 1

The difference between Physisorption and Chemisorption are stated below. Here adsorbate is held on the surface of adsorbent by van der Waals force. Here molecules of adsorbate and adsorbent are held by chemical bonds.

Answer 2

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PHYSISORPTION :-

➡ It arises because of van der waal's forces.

➡It is not specific in nature.

➡It is reversible in nature.

➡It depends on the nature of gas easily liquefiable gases are adsorbed readily.

➡Enthalpy of adsorption is low (20-40 KJ mol-1).

CHEMISORPTION :-

➡It is caused by chemical bond formation.

➡It is highly specific in nature.

➡It is irreversible.

➡It also depends on the nature of gas gases which can react with the adsorbent show chemisorption.

➡Enthalpy of adsorption is high (80-240 KJ mol-1).

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