Question:
Which from following statements is NOT true about physisorption?
Which from following statements is NOT true about physisorption?
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Physisorption:
Weak + Reversible + Low heat
Updated On: May 8, 2026
- The forces operating are weak van der Waals forces.
- It is not specific in nature.
- It is irreversible.
- The heat of adsorption is low and lies in the range $20 - 40 \text{ kJ mol}^{-1}$.
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The Correct Option is C
Solution and Explanation
Concept: Physisorption involves weak intermolecular forces.
• Weak van der Waals forces
• Low heat of adsorption (20–40 kJ/mol)
• Non-specific
• Reversible in nature
Step 1: Check each statement.
• (A) True
• (B) True
• (C) False (physisorption is reversible)
• (D) True
Step 2: Conclusion.
Thus, incorrect statement is that it is irreversible. Final Answer: Option (C)
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