Question

A process will be spontaneous at all temperatures if :

• 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: (B)

$ \Delta G = \Delta H - T \Delta S$
for spontaneous process at all temp. $ \Delta G < 0$ and it is possible when $ \Delta H < 0$ and $ \Delta S > 0$.