`MnO_2` is 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
`MnO_2` dissolve in concentrated HCl to form :

Options

A. `Mn^(4+)` ion and `Cl_2`
B. `Mn^(2+)` ion and `Cl_2`
C. `[MnCl_2]^(-2) and Cl_2`
D. only `[MnCl_4]^(-2)`

Answer

B

Explanation

`MnO_2 +HCl rarr MnCl_2 +Cl_2`