MCAT General Chemistry Question 197: Answer and Explanation
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Question: 197
1. Which one of the salts in Table 1 has the smallest value of ∆Godiss?
- A. absorbed during the breaking of H—H bonds and the reaction is spontaneous.
- B. released during the formation of H—H bonds and the reaction is nonspontaneous.
- C. absorbed during the formation of O=O bonds and the reaction is spontaneous.
- D. released during the breaking of O—H bonds and the reaction is nonspontaneous.
Correct Answer: B
Explanation:
B Electrolysis requires energy. Water will not split into hydrogen and oxygen gas spontaneously at standard temperature and pressure which eliminates choices A and C. When bonds are broken, energy is absorbed (eliminates choice D). Energy is released when bonds are formed.