Question

A process will be spontaneous to 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

The correct option is B $\Delta H<0$ and $\Delta S>0$

Solution:- (B) $\Delta H<0$ and $\Delta S>0$

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

For reaction to be spontaneous process at all temperature, $\Delta G<0$ and it is possible when $\Delta H<0$ and $\Delta S>0$ because it gives$\Delta G<0$.