Which of the following statement is correct for the spontaneous adsorption of a gas?

Options

A. `Delta S` is positive and, therefore, `Delta H` should be negative
B. `Delta S` is positive and, therefore, `Delta H` should also be highly positive
C. `Delta S` is negative and, therefore, `Delta H` should be highly positive
D. `Delta S` is negative and therefore, `Delta H` should be highly negative

Answer

D

Explanation

Adsorption decreases the entropy of gas so `Delta S lt 0`. For a spontaneous process `Delta G lt 0 and Delta G= Delta H- T Delta S`. Thus `Delta H` should be highly negative