Pyrolusite is `MnO_(2)` used to prepare `KMnO_(4)` step are:
`MnO_(2)undersetto(I)MnO_(4)^(2-)undersetto(II)MnO_(4)^(-)`
Step I and II are respectively:

Pyrolusite is MnO_(2) used to prepare KMnO_(4) . Steps are, MnO_(2)overset(I)(rarr)MnO_(4)^(2-)overset(II)(rarr)MnO_(4)^(-) Steps I and II are respectively :

Pyrolusite is MnO_(2) used to prepare KMnO_(4) . Steps are, MnO_(2)overset(I)(rarr)MnO_(4)^(2-)overset(II)(rarr)MnO_(4)^(-) Steps I and II are respectively :

MnO_(2) overset(I)(to)MnO_(4)^(2-)overset(II)(to)MnO_(4)^(-) I and II are

MnO_(4)^(2-) can be converted to MnO_(4)^(-)

The reaction MnO_(4)^(-) + e^(-) to MnO_(4)^(2-) occur in

K_(2)MnO_(4)+H^(+) to KMnO_(4)+MnO_(2)darr