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COMEDK2023Morning ShiftChemistryd and f Block ElementsActual

In dilute alkaline solution MnO ₄⁻ changes to

Options

  1. AMn ₂ O ₃
  2. BMnO
  3. CMnO ₄²⁻
  4. DMnO ₂

Correct answer

D. MnO ₂

Step-by-step solution

In a dilute alkaline or neutral medium, the permanganate ion MnO ₄⁻ acts as an oxidizing agent and undergoes reduction to form manganese dioxide, MnO ₂ . The balanced chemical equation for this reduction is: 2 MnO ₄⁻ + H ₂ O + 3e⁻ 2 MnO ₂ + 2 OH ⁻ In this reaction, the oxidation state of manganese changes from +7 in MnO ₄⁻ to +4 in MnO ₂ . Answer: MnO ₂

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