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 $\Delta H < 0$.

Similar Questions

Why does physisorption decrease with the increase of temperature?

Physical adsorption is inversely proportional to the

Statement $I$: Silica gel and alumina are used as adsorbents for adsorption chromatography.
Statement $II$: Paper chromatography is a type of partition chromatography.
In the light of the above statements,select the correct option.

Which of the following is true in respect of chemical adsorption?

Assertion : The enthalpy of physisorption is greater than chemisorption.
Reason : Molecules of adsorbate and adsorbent are held by van der Waal's forces in physisorption and by chemical bonds in chemisorption.

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