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The gas molecules are held on solid surface by _________ in physical adsorption.

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The gas molecules are held on solid surface by _________ in physical adsorption.

(a) Chemical forces

(b) Gravitational forces

(c) Electrostatic forces

(d) Vander Waal’s forces

I got this question in class test.

My question comes from Liquids and Solids in Equilibrium with Solids in portion Miscellaneous of Chemical Process Calculation

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Right answer is (d) Vander Waal’s forces

The best explanation: Chemisorption is the adsorption when interaction between the solid and the condensed molecules is relatively strong as contrasted with physical adsorption.

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