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 batteriesMnO_2 dissolve in concentrated HCl to form :

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 batteriesMnO_2 dissolve in concentrated HCl to form :
Answer» `Mn^(4+)` ion and `Cl_2` `Mn^(2+)` ion and `Cl_2` `[MnCl_2]^(-2) and Cl_2` only `[MnCl_4]^(-2)` SOLUTION :`MnO_2 +HCL RARR MnCl_2 +Cl_2`