Question

Although entropy change is negative, still adsorption of gas on solid is spontaneous why

Answer 1

It leads to a decrease in the residual forces on the surface of the adsorbent. This causes a decrease in the surface energy of the adsorbent. Therefore even if ΔS is negative, but ΔH is also negative to make ΔG negative. So, adsorption is a spontaneous process accompanied by release in energy and decrease in entropy

Answer 2

Answer:

The entropy change for adsorption is negative ( ΔS<0 ). Thus, there is decrease in entropy as there is decrease in randomness due to association between adsorbate and adsorben