Question:
Which one of the following statements is correct about chemisorptions?
Which one of the following statements is correct about chemisorptions?
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Chemisorption involves strong bond formation and requires activation energy, hence increases with temperature.
Updated On: Jun 20, 2026
- It is reversible, favoured at high temperature
- It is irreversible, favoured at high temperature
- It is irreversible, favoured at low temperature
- It is reversible, favoured at low temperature
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The Correct Option is B
Solution and Explanation
Step 1: Understand chemisorption.
Chemisorption involves formation of strong chemical bonds (covalent or ionic) between adsorbate and adsorbent surface. It is a monolayer adsorption and involves high activation energy.
Step 2: Nature of chemisorption.
Since actual chemical bonds are formed, chemisorption is generally irreversible or difficult to reverse under normal conditions. This distinguishes it from physisorption which is weak and reversible.
Step 3: Effect of temperature.
Chemisorption requires activation energy, so increasing temperature helps molecules overcome this barrier and enhances adsorption rate. Hence it is favored at higher temperature.
Step 4: Compare with physisorption.
Physisorption is favored at low temperature and is reversible, whereas chemisorption behaves opposite due to bond formation and activation energy requirement.
Step 5: Evaluate options.
Only option stating irreversible nature and high temperature favorability matches characteristics of chemisorption.
Step 6: Final conclusion.
Thus chemisorption is irreversible and favored at high temperature.
Final Answer: \[ \boxed{(2)} \]
Chemisorption involves formation of strong chemical bonds (covalent or ionic) between adsorbate and adsorbent surface. It is a monolayer adsorption and involves high activation energy.
Step 2: Nature of chemisorption.
Since actual chemical bonds are formed, chemisorption is generally irreversible or difficult to reverse under normal conditions. This distinguishes it from physisorption which is weak and reversible.
Step 3: Effect of temperature.
Chemisorption requires activation energy, so increasing temperature helps molecules overcome this barrier and enhances adsorption rate. Hence it is favored at higher temperature.
Step 4: Compare with physisorption.
Physisorption is favored at low temperature and is reversible, whereas chemisorption behaves opposite due to bond formation and activation energy requirement.
Step 5: Evaluate options.
Only option stating irreversible nature and high temperature favorability matches characteristics of chemisorption.
Step 6: Final conclusion.
Thus chemisorption is irreversible and favored at high temperature.
Final Answer: \[ \boxed{(2)} \]
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