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JEE MainChemistryd and f Block Elements

When potassium permanganate reacts with potassium iodide in a faintly alkaline or neutral medium, the major products containing manganese and iodine are respectively:

Options

  1. AMn ²⁺ and I ₂
  2. BMnO ₂ and I ₂
  3. CMnO ₂ and IO ₃^-
  4. DMn ²⁺ and IO ₃^-

Correct answer

C. MnO ₂ and IO ₃^-

Step-by-step solution

In a faintly alkaline or neutral medium, potassium permanganate ( KMnO ₄ ) acts as an oxidising agent and is reduced to manganese dioxide ( MnO ₂ ), where the oxidation state of Mn changes from +7 to +4. Simultaneously, it oxidises iodide ions ( I ^- ) to iodate ions ( IO ₃^- ). The balanced chemical equation is: 2 MnO ₄^- + H ₂ O + I ^- 2 MnO ₂ + 2 OH ^- + IO ₃^- Answer: MnO ₂ and IO ₃^-

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