(i). why is adsorption always exothermic? (ii). Physisorption is mult

1.	(i). why is adsorption always exothermic? (ii). Physisorption is multi layered while chemisorption is mono layered.
Answer» (i) The particles are attached to the surface of another medium for the reaction to take place. During this process the residual forces on the surface of adsorbent decreases which in turn decreases the surface energy. This energy appears in the form of heat, hence adsorption is exothermic in nature. (ii) Chemisorption takes place as a result of the reaction between adsorbent and adsorbate. When the surface of the adsorbent is covered with one layer, no further reaction can take place. Physisorption is simply by Vander Wall’s forces. So any number of layers may be formed one over the other on the surface of the adsorbent.

(i). why is adsorption always exothermic? (ii). Physisorption is multi layered while chemisorption is mono layered.

Answer»

(i) The particles are attached to the surface of another medium for the reaction to take place. During this process the residual forces on the surface of adsorbent decreases which in turn decreases the surface energy. This energy appears in the form of heat, hence adsorption is exothermic in nature.

(ii) Chemisorption takes place as a result of the reaction between adsorbent and adsorbate. When the surface of the adsorbent is covered with one layer, no further reaction can take place. Physisorption is simply by Vander Wall’s forces. So any number of layers may be formed one over the other on the surface of the adsorbent.

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