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

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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.

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

  • 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.
  • 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.
  • Effect of pressure: Adsorption is a reversible process and is accompanied by a decrease in pressure. Therefore adsorption increases with an increase in pressure.
  • Effect of temperature: Adsorption is an exothermic process. Thus in accordance with Leehatelie’s principle the magnitude of adsorption decreases with an increase in temperature.
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Factors which influence the adsorption of a gas on a solid is as follows: 

1. Nature of the gas: 

Easily liquifiable 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 is easily liquifiable gases.

2. Surface area of the solid: 

The greater the surface area of the adsorbant, the greater is the adsorption of 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.

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