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NDA 2021 GAT · General Knowledge · Chemical Reactions · hard

The oxidation state of manganese in potassium permanganate (KMnO4) is

Single correct option

The oxidation state of manganese in potassium permanganate (KMnO4) is
  1. A. +2
  2. B. +4
  3. C. +7
  4. D. +6
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Answer: (C) +7

Potassium is +1 and each oxygen is -2, so 1 + x + 4(-2) = 0 gives x = +7. Oxidation state +2 is found in MnSO4, +4 in MnO2 and +6 in K2MnO4 (manganate), which are common distractors.
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Original question written in the NDA 2021 GAT pattern and checked twice for the correct answer. Not an official question paper. How we write and check questions · Corrections policy · Report a mistake