1.

How will you prepare potassium permagnate from pyrulusite ore? Write chemical equation involved.

Answer»

Potassium permagnate is prepared from pyrulsite first of all. Pyrulusite is oxidised in alkaline medium in the presence of air or oxidising agent like KNO3 to give potassium magnate, which undergoes disproportion reaction in acidic medium to give potassium permagnate.

2MnO2 + 4KOH + O2 → 2K2MnO4 + 2H2O

3MnO4- + 4H+ → 2MnO4 + MnO2 + 2H2O



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