What is the oxidation number of manganese in KMnO4?
Answer and explanation
Correct answer: C. +7
- Step 1: The compound is neutral: +1 + x + 4 x (-2) = 0. Step 2. Solving gives x = +7. Answer: +7. Why not the others: The ion charge is -1 overall, but it does not equal the manganese oxidation number.
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