Browse Questions

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

Answer : decrease in free - energy of the system & enthalpy of the system both
Explanation :
As adsorption is spontaneous , $\;\bigtriangleup G\;$ for the process is -ve . Adsorption is accompanied by decrease in randomness , Therefore $\;\bigtriangleup S\;$ and $\;T \bigtriangleup S\;$ for the process is also negative . As $\;\bigtriangleup S\;$ for the process is - ve and the process is spontaneous , $\;\bigtriangleup H\;$ for the process has to be - ve i. e . enthalpy of the system decreases .