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How can we prepare kmno4 from …

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How can we prepare kmno4 from pyrolusite ore

    • Posted by Aditya Arora 6 years, 4 months ago

    CBSE > Class 12 > Chemistry
    • 1 answers

    Jayant Tehlan 6 years, 4 months ago

    Pottassium Permanganate (KMnO4) is prepared fromPyrolusite ore (MnO2). The finely powdered Pyrolusite ore(MnO2) is fused with an alkali metal hydroxide like KOH in the presence of air or an oxidizing agent like KNO3 to give the dark green potassium Manganate (K2MnO4). Potassium manganate disproportionate in a neutral or acidic solution to give potassium permanganate. 2 MnO2 + 4 KOH + O2 ----------> 2K2MnO4 + 2H2O 3 MnO42- + 4H+ ------------> 2MnO4- + MnO2 + 2H2O Commercially potassium permanganate is prepared by the alkaline oxidative fusion of Pyrolusite ore (MnO2) followed bythe electrolytic oxidation of manganate (4) ion. 2 MnO2 + 4KOH + O2 -----------> 2K2MnO4 + 2H2O MnO42- ------(electrolytic oxidation)----> MnO4- + e-

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