Question

The correct statement regarding chemisorption is

• A. It is a multilayered adsorption
• B. The process is reversible in nature
• C. The process is not specific in nature
• D. Enthalpy of adsorption is in the range of 80-240 kJ mol\(^{-1}\)

Hint:

Chemisorption involves the formation of strong chemical bonds and is specific to the adsorbent. The enthalpy of adsorption is relatively high compared to physisorption.

Answer 1

The Correct Option is D

Chemisorption refers to the process where the adsorbate forms strong chemical bonds with the adsorbent. 
It involves a single layer of adsorbate and is generally specific to the adsorbent. The key characteristics of chemisorption are: 
Step 1: Unlike physisorption (which is multilayered), chemisorption involves a single layer of adsorption. Therefore, statement (1) is incorrect. 
Step 2: Chemisorption is not typically reversible, as the bonds formed are strong. Therefore, statement (2) is incorrect. 
Step 3: Chemisorption is highly specific in nature, as it involves the formation of chemical bonds. Thus, statement (3) is incorrect. 
Step 4: The enthalpy of adsorption for chemisorption typically lies in the range of 80-240 kJ/mol, which is consistent with the high energy of bond formation in this process. Thus, statement (4) is correct.