How is KMnO4 prepared from pyrolusite ore?

Answer:

Potassium Permanganate (KMnO₄) is an inorganic chemical compound. It is also known as Condy’s crystals or permanganate of potash.

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). In a neutral or acidic solution, potassium manganate is disproportionate to bringing potassium permanganate.

2 MnO₂ + 4 KOH + O₂ → 2K₂MnO₄ + 2H₂O

3 MnO₄^2- + 4H⁺ → 2MnO^4- + MnO₂ + 2H₂O