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Potassium Permanganate

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Question

Solve this question in detailed manner :
A blackish brown solid A when fused with sodium or potassium hydroxide in the presence of air, produces a dark green-coloured mass of compound B, which on electrolytic oxidation gives a dark purple-coloured compound C. Identify A, B and C. What happens when acidic solution of green-coloured compound B is allowed to stand for some time? Write the reactions involved.

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Solution

Dear Student

a)

A= MnO₂ B= K₂ MnO₄ C= KMnO₄

MnO₂ + 4KOH + O₂→ K₂ MnO₄ + 2H₂ O

MnO₄²^- →(electrolytic oxidation in alkaline solution) MnO₄^-

^{(green) (purple)}

b) 3MnO₄²^- + H⁺ → 2MnO₄^-+ MnO₂+ 2H₂ O

Here, MnO₄^- so formed is purple in colour and MnO₂ is the black precipitate.

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