JEE Main 26-Aug-2021 Shift 1 Solved Paper

The ΔH (enthalpy change) and ΔS (entropy change) will be less than zero for adsorption of gas on solid surface, i.e. ΔH<0,ΔS<0.
Entropy change ( ΔS ) The randomness of the gas molecules decreases as they are adsorb on solid surface due to restriction in their motion.
∴ ∆S is negative.
Enthalpy change (ΔH) Adsorption of gas on solid surface is an exothermic process, as there is force of attraction between adsorbate and adsorbent.
∴ ∆H is negative.