Question

Which of the following is true for spontaneous adsorption of $H_2$ gas without dissociation on solid surface

• A. Process is exothermic and $\Delta \, S < 0$
• B. Process is endothermic and $\Delta \, S > 0$
• C. Process is exothermic and $\Delta \, S > 0$
• D. Process is endothermic and $\Delta \, S < 0$

Answer 1

Answer: (A)

Process is exothermic and $\Delta \, S < 0$

Answer 2

Adsorption of $H _{2}$ gas on solid surface is exothermic and entropy decreases in the process. $\therefore \Delta S<0$