Question:
Which of the following is NOT a characteristic of chemisorption?
Which of the following is NOT a characteristic of chemisorption?
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Chemisorption = Unimolecular layer + Specific; Physisorption = Multimolecular layer + Non-specific.
Updated On: Apr 30, 2026
- It is specific.
- Heat released is in the range of $40 - 200$ kJ/mol
- Formation of multimolecular layer of adsorbate.
- It is irreversible.
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The Correct Option is C
Solution and Explanation
Step 1: Concept
Chemisorption (chemical adsorption) involves the formation of chemical bonds between the adsorbent and adsorbate.
Step 2: Analysis
- Chemisorption is highly specific , irreversible, and involves high enthalpy of adsorption ($80 - 240$ kJ/mol). - Because it requires a direct chemical bond with the surface, it can only form a unimolecular (single) layer. - Multimolecular layers are a characteristic of Physisorption.
Step 3: Conclusion
Therefore, statement (C) is not a characteristic of chemisorption.
Final Answer: (C)
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