Question:
Adsorption is accompanied by
Adsorption is accompanied by
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Adsorption is usually exothermic and causes particles to become more ordered on the surface.
Updated On: Apr 29, 2026
- Decrease in enthalpy and decrease in entropy
- Increase in enthalpy and decrease in entropy
- Decrease in enthalpy and increase in entropy
- Increase in enthalpy and increase in entropy
- No change in enthalpy and entropy
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The Correct Option is A
Solution and Explanation
Concept:
Adsorption is generally an exothermic process and decreases randomness of particles.
Step 1: Effect on enthalpy.
During adsorption, attractive forces are formed between adsorbent and adsorbate. Hence heat is released: \[ \Delta H < 0 \] So enthalpy decreases.
Step 2: Effect on entropy.
Gas or solute particles become fixed on the surface, so randomness decreases: \[ \Delta S < 0 \]
Step 3: Final answer.
Thus, adsorption is accompanied by decrease in enthalpy and decrease in entropy.
Step 1: Effect on enthalpy.
During adsorption, attractive forces are formed between adsorbent and adsorbate. Hence heat is released: \[ \Delta H < 0 \] So enthalpy decreases.
Step 2: Effect on entropy.
Gas or solute particles become fixed on the surface, so randomness decreases: \[ \Delta S < 0 \]
Step 3: Final answer.
Thus, adsorption is accompanied by decrease in enthalpy and decrease in entropy.
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