4 KMnVIIO4-II + 2 H2SO4-II 4 MnIVO2-II + 2 K2SO4-II + 3 O20 + 2 H2O-II

This is an oxidation-reduction (redox) reaction:

4 MnVII + 12 e- 4 MnIV (reduction)

6 O-II - 12 e- 6 O0 (oxidation)

Change the oxidation states