Considering entropy (S) as a thermodynamic parameter, the criterion for the spontaneity of any process is:
- $\Delta \mathrm{S}_{\text {system }}+\Delta \mathrm{S}_{\text {surrounding }} > 0$
- $\Delta \mathrm{S}_{\text {system }}-\Delta \mathrm{S}_{\text {surrounding }} > 0$
- $\Delta \mathrm{S}_{\text {System }} > 0$ only
- $\Delta \mathrm{S}_{\text {Surroundings }} > $ only
Solution
For the latter two cases, the temperature at which the spontaneity changes will be determined by the relative magnitudes of $\triangle S$ and $\Delta H$.Asked in: NEET 2004