Question

difference between physisorption and chemisorption

Answer 1

Chemisorption is a process of adsorption which involves a chemical reaction between the adsorbate and the surface.

Whereas physisorption is the process by which the electronic structure of the atom or molecule is barely unsettled by adsorption.

The two terms are different in terms of specificity, reversibility, temperature dependence etc.

In each of these regards, they yield different results and thus react differently.

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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