Adsorption is:

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(A) Adsorption is a surface phenomenon where particles of a substance (adsorbate) accumulate on the surface of another substance (adsorbent). During t

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Always exothermic

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(A) Adsorption is a surface phenomenon where particles of a substance (adsorbate) accumulate on the surface of another substance (adsorbent). During the process of adsorption,there is a decrease in the residual forces acting on the surface of the adsorbent,which leads to a decrease in surface energy. This decrease in surface energy is released as heat. Therefore,the process of adsorption is always exothermic,meaning $\Delta H < 0$.

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