The following statements relate to the adsorption of gases on a solid surface. Identify the incorrect statement among them:
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- Entropy of adsorption is negative
- Enthalpy of adsorption is negative
- On adsorption decrease in surface energy appears as heat
- On adsorption, the residual forces on the surface are increased
The Correct Option is D
Solution and Explanation
The process is spontaneous (\(\Delta G \lt 0\)) with \(\Delta S \lt 0\), so \(\Delta H = \Delta G + T\Delta S \lt 0\): enthalpy of adsorption is negative (statement 2 true).
The unbalanced residual forces on the surface attract gas molecules; the resulting decrease in surface energy is released as heat (statement 3 true).
Because the surface forces are used up in binding the adsorbate, the residual forces on the surface are decreased, not increased (statement 4 false).
Answer: (4) On adsorption, the residual forces on the surface are increased
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