Question -
Answer -
There are various factors thataffect the rate of adsorption of a gas on a solid surface.
(1) Nature of the gas:
Easily liquefiable gases such asNH3, HCl etc. are adsorbed to a great extent in comparison to gasessuch as H2, O2 etc. This is because Van der Waal’sforces are stronger in easily liquefiable gases.
(2) Surface area of thesolid
The greater the surface area ofthe adsorbent, the greater is the adsorption of a gas on the solid surface.
(3) Effect of pressure
Adsorption is a reversibleprocess and is accompanied by a decrease in pressure. Therefore, adsorptionincreases with an increase in pressure.
(4) Effect of temperature
Adsorption is an exothermicprocess. Thus, in accordance with Le-Chatelier’s principle, the magnitude ofadsorption decreases with an increase in temperature.