Question: how kmno4 is prepared from mno2?
Answer: 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).