MnO_2is the most important oxide of manganese. MnO_2 occurs naturally as the black coloured mineral pyrolusite. It is an oxidising agent, and decomposes to Mn_3O_4 on heating to 530^(0) C. It is used in the preparation of potassium permanaga-nate and in the production of Cl_2 gas. Over half a million tonnes per year of MnO_2 is used in dry batteries In the laboratory, MnO_2 is made by :

MnO_2is the most important oxide of manganese. MnO_2 occurs naturally

1.	MnO_2is the most important oxide of manganese. MnO_2 occurs naturally as the black coloured mineral pyrolusite. It is an oxidising agent, and decomposes to Mn_3O_4 on heating to 530^(0) C. It is used in the preparation of potassium permanaga-nate and in the production of Cl_2 gas. Over half a million tonnes per year of MnO_2 is used in dry batteries In the laboratory, MnO_2 is made by :
Answer» heating Mn in `O_2` OXIDISING `Mn^(2+)` in air electrolytic oxidation of `MnO_4` Precipitating `MnO_2` from SOLUTION when perfoming TITRATION of `KMnO_(4)` Solution :`MnO_4^- overset(OH^-) rarr MnO_2`