Question

Physical adsorption of a gaseous species may change to chemical adsorption with:

• A. decrease in temperature
• B. increase in temperature
• C. increase in surface area of adsorbent
• D. decrease in surface area of adsorbent

Answer 1

Answer: (B)

increase in temperature

Physical adsorption of a gaseous species may change to chemical adsorption with increase in temperature.
As temperature increases, the energy possessed by reactant molecules increases. At a certain temperature, this energy becomes greater than or equal to the activation energy. This results in the formation of a chemical bond.