Describe preparation of KMnO4 from pyrolusite.

Pottassium Permanganate(KMnO₄) is prepared fromPyrolusite ore(MnO₂). The finely powderedPyrolusite ore(MnO₂)is fused with an alkali metal hydroxide like KOH in the presence of air or an oxidizing agent like KNO₃to give the dark greenpotassium Manganate(K₂MnO₄). Potassium manganate disproportionate in a neutral or acidic solution to givepotassium permanganate.

2 MnO₂+ 4 KOH + O₂---------- 2K₂MnO₄+ 2H₂O


3 MnO₄^2-+ 4H⁺------------ 2MnO₄^-+ MnO₂+ 2H₂O

Commerciallypotassium permanganate is preparedby the alkaline oxidative fusion ofPyrolusite ore(MnO₂)followed bythe electrolytic oxidation of manganate (4) ion.

2 MnO₂+ 4KOH + O₂----------- 2K₂MnO₄+ 2H₂O

Pottassium Permanganate(KMnO₄) is prepared fromPyrolusite ore(MnO₂). The finely powderedPyrolusite ore(MnO₂)is fused with an alkali metal hydroxide like KOH in the presence of air or an oxidizing agent like KNO₃to give the dark greenpotassium Manganate(K₂MnO₄). Potassium manganate disproportionate in a neutral or acidic solution to givepotassium permanganate.

2 MnO₂+ 4 KOH + O₂---------- 2K₂MnO₄+ 2H₂O


3 MnO₄^2-+ 4H⁺------------ 2MnO₄^-+ MnO₂+ 2H₂O

Commerciallypotassium permanganate is preparedby the alkaline oxidative fusion ofPyrolusite ore(MnO₂)followed bythe electrolytic oxidation of manganate (4) ion.

2 MnO₂+ 4KOH + O₂----------- 2K₂MnO₄+ 2H₂O

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