Question

Which of the following is applicable to the phenomenon of adsorption ?

• A. $\Delta S>0$
• B. $\Delta S<0$
• C. $\Delta S=0$
• D. All of the above

Answer 1

The correct option is B $\Delta S<0$

The accumulation of molecular species at the surface rather than in the bulk of a solid or liquid is termed adsorption.
When a gas is adsorbed, the freedom of movement of its molecules become restricted. This amounts to decrease in the entropy of the gas after adsorption, i.e., $\Delta S$ is negative.
$\Delta S=-ve$