Question

For an exothermic reaction to be spontaneous:

• A. temperature must be high
• B. temperature must be zero
• C. temperature may have any magnitude
• D. temperature must be low

Answer 1

The correct option is D temperature must be low

Gibb's free energy equation : $\Delta G=\Delta H-T\Delta S$

For spontaneous reaction : $\Delta G<0$

For exothermic reaction : $\Delta H<0$

If $\Delta H<0$ & $\Delta S>0$, the temperature can have any value for reaction to be spontaneous. Because, $\Delta H<0\&T\Delta S>0$, So the $\Delta G<0$.