Question

In which of the following conditions, the reaction will be always spontaneous?

• A. $\Delta H <0$ and $\Delta S <0$
• B. $\Delta H >0$ and $\Delta S >0$
• C. $\Delta H >0$ and $\Delta S <0$
• D. $\Delta H <0$ and $\Delta S >0$

Answer 1

Answer: (D)

$\Delta G=\Delta H-T \Delta S$

For spontaneous process, $\Delta G =- ve$

$\therefore \Delta H <0$ and $\Delta S >0$