MCQ
A process will be spontaneous at all temperatures if
- A$\Delta H < 0$ and $\Delta S < 0$
- ✓$\Delta H < 0$ and $\Delta S > 0$
- C$\Delta H > 0$ and $\Delta S > 0$
- D$\Delta H > 0$ and $\Delta S < 0$
✓
Answer
Correct option: B.
$\Delta H < 0$ and $\Delta S > 0$
b
At constant $P$ and $T$ and for the process to be spontaneous we should have $\Delta G = -ve$ and we know that $\Delta G = \Delta H - T\Delta S$
At constant $P$ and $T$ and for the process to be spontaneous we should have $\Delta G = -ve$ and we know that $\Delta G = \Delta H - T\Delta S$
If $\Delta H = -ve$ and $\Delta S = +ve$ then at all the temperature the process will be spontaneous.
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