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 batteriesWhen MnO_2 is fused with KOH in the presence of air, the product formed is :

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 batteriesWhen MnO_2 is fused with KOH in the presence of air, the product formed is :
Answer» purple COLOUR `KMnO_4` green colour `K_2MnO_4` COLOURLESS `MnO_4` purple colour `K_2MnO_4` Solution :`MnO_2 + KOH + AIR RARR K_2MnO_4`