Question

For endothermic reaction when a change in entropy is negative, then the reaction is:

• A. not possible at any temperature
• B. possible at low temperature
• C. possible at all temperature
• D. possible at high temperature

Answer 1

Answer: (A)

not possible at any temperature

Endothermic reaction $\Rightarrow \Delta H>O$

$\Delta S<O$

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

$\therefore \Delta G>O$ always

$\therefore$ the reaction is not possible at any temperature.