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CBSE Class 12-science Answered

Give the commercial method for the preparation of KMnO4.
Asked by Topperlearning User | 27 Jun, 2014, 09:08: AM
answered-by-expert Expert Answer

Ist step: Fusion of MnO2 with an alkali metal hydroxide and an oxidising agent like KNO3.

2MnO2 + 4KOH + O2    2K2MnO4 + 2 H2O
IInd step:
3MnO4 2– + 4H+ →  2MnO4 + MnO2 + 2H2O

Commercially it is prepared by the Electrolytic oxidation of manganate(VI).
MnO42-   MnO4-
Manganate                               Permanganate 
Answered by | 27 Jun, 2014, 11:08: AM

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