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In the first step, MnO 2 is oxidized with KOH in the presence of O 2 to form K 2 MnO 4 : 2MnO 2 + 4KOH + O 2 → 2K 2 MnO 4 + 2H 2 O
Ref: NCERT Class 12 Chemistry > Chapter 4: d and f Block Elements > Topic: Preparation and Properties of Potassium Dichromate and Permanganate
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