What is the oxidation state of manganese in potassium permanganate, KMnO4?
Answer and explanation
Correct answer: B. +7
- Step 1: Potassium is +1 and four oxygen atoms are -2 each, giving -8. Step 2. For a neutral compound Mn must be +7, because +1 + 7 - 8 = 0. Answer: +7. Why not the others: +2, +4 and +6 are found in other manganese compounds.
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