Question: how is kmno4 prepared from pyrolusite?
Answer: How is KMnO4 prepared from pyrolusite ore? Answer: ... In the presence of air or an oxidizing agent such as KNO3, the finely powdered Pyrolusite ore(MnO2) is fused with an alkali metal hydroxide such as KOH to give the dark green potassium manganese (K2MnO4).