Question

What are the factors which influence the absorption of a gas on a solid?

Answer 1

Factors Affecting Adsorption of Gases by Solids:

Nature of surface area of the adsorbent
Nature of the gas being adsorbed
Temperature
Pressure

Answer 2

Answer:

There are various factors that affect the rate of adsorption of a gas on a solid surface.  

(1) Nature of the gas:

Easily liquefiable gases such as NH3, HCl etc. are adsorbed to a great extent in comparison to gases such as H2, O2 etc.

This is because Van der Waal’s forces are stronger in easily liquefiable gases.  

(2) Surface area of the solid

The greater the surface area of the adsorbent, the greater is the adsorption of a gas on the solid surface.  

(3) Effect of pressure

Adsorption is a reversible process and is accompanied by a decrease in pressure.  

Therefore, adsorption increases with an increase 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.