Question

Spontaneous adsorption of gas on solid surface is an exothermic process because

• A. $\Delta H$ increases for system
• B. $\Delta S$ increases for gas
• C. $\Delta S$ decreases for gas
• D. $\Delta G$ increases for gas

Answer 1

Answer: (C)

When a gas is adsorbed spontaneously on a solid surface, entropy decreases for gas.