Adsorption is accompanied by

Question

$\begin{array}{1 1} \text{(a) decrease in enthalpy of the system only} \\ \text{(b) increase in entropy of the system} \\ \text{(c) decrease in free - energy of the system & enthalpy of the system both} \\ (d) \;T \bigtriangleup S\; \text{ for the process is positive} \end{array}$