TS EAMCET 5-Aug-2021 Shift 2 Question Paper

Option (a) is wrong as enthalpy of adsorption is negative because heat is liberated during adsorption. During the adsorption of a gas on the surface of a solid, the following is true.
Adsorption is spontaneous process therefore change in Gibb's free energy is negative (∆G<0).
It is an exothermic process. Hence, the enthalpy change is negative ∆H<0.