. Extent of physisorption of a gas increases with


A: increase in temperature

B: decrease in temperature

C: decrease in surface area of adsorbent

D: decrease in strength of van der Waals forces

 

Best Answer

Explanation:

Le Chatelier's principle states that  If a chemical reaction is at equilibrium and experiences a change in pressure,

temperature, or concentration of products or reactants, the equilibrium shifts in the opposite direction to the change.

In exothermic equilibrium, an increase in temperature decreases the product formation and a decrease in temperature increases product formation.

The  degree of physisorption of gas increases with decreases in temperature. 

 Particles of physisorption are held by the weak van der Waals  force to the surface. 

Final Answer :

Hence the correct answer is (B) decrease in temperature

 

 

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