Question

When the rate of physical adsorption will increase ?

• A. By reducing temperature
• B. By increasing pressure
• C. By increasing temperature
• D. both $A$ and $B$

Answer 1

Answer: (D)

both $A$ and $B$

In case of physisorption of gases over solids, the extent of adsorption increases with increase in pressure as the volume of the gases decrease during adsorption (Le-Chatelier's Principle).During adsorption, the volume of gases decreases along with the liberation of heat. Hence at high pressures and low temperatures, adsorption is favored. Whereas at low pressures and high temperatures, desorption is favored.