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MHT CET202522 Apr 2025Morning ShiftChemistryRedox ReactionsActual

What is the difference in oxidation number of Mn in KMnO ₄ and MnO ₂ ?

Options

  1. A1
  2. B3
  3. C4
  4. D5

Correct answer

B. 3

Step-by-step solution

The oxidation number of manganese in each compound must be determined to find their difference. In KMnO ₄ , potassium has an oxidation state of +1 and oxygen is -2 . For charge neutrality: 1 (+1) + x + 4 (-2) = 0 x - 7 = 0 x = +7 In MnO ₂ , oxygen again contributes -2 per atom: y + 2 (-2) = 0 y = +4 The difference in oxidation numbers is +7 - (+4) = 3 . The final answer is B

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