1) Which of the following is true for spontaneous adsorption of $H_{2}$ gas without dissociation on a solid surface A) Process is exothermic and $\triangle S <0 $ B) Process is endothermic and $\triangle S >0$ C) Process is exothermic and $\triangle S >0$ D) Process is endothermic and $\triangle S <0$ Answer: Option AExplanation: Adsorption of $H_{2}$ gas on a solid surface is exothermic and entropy decreases in the process $\triangle S <0$
