A change in state involving a decrease in entropy can be spontaneous, only if ____________________?
Correct answer: A. It is exothermic
- A. It is exothermic
- B. It is isenthalpic
- C. It takes place isothermally
- D. It takes place at constant volume
Explanation
If the system entropy decreases, spontaneity requires enough entropy increase in the surroundings, which occurs through heat release, so the process must be exothermic. Exothermicity alone is not always sufficient, but it is necessary for a spontaneous entropy-decreasing process under the usual conditions.
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