discuss the factors which influence adsorption of a gas on a solid surface
Answers
so it will release energy. Adsorption means the adhesion of liquids or gases on the surface of a solid. This causes the randomly oriented molecules of the gas or the liquid to be organised on the surface of the solid. This organisation decreases the entropy.
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Answer:
Rate of adsorption of a gas on a solid surface depends on various factors:
(1) Nature of the gas:
There is a strong Van der Waal’s forces in easily liquefiable gases hence, easily liquefiable gases such as NH3, HCl etc. are adsorbed to a great extent in comparison to gases such as H2, O2 etc.
(2) Surface area of the solid
The adsorption rate of a gas on the solid surface increases with the increase in the surface area of the adsorbent.
(3) Effect of pressure
Adsorption increases with an increase in pressure and, as a result adsorption is a reversible process and is accompanied by a decrease in pressure
(4) Effect of temperature
Adsorption is an exothermic process. Thus, in accordance with Le-Chatelier’s principle, the magnitude of adsorption decreases with an increase in temperature.