4 KMnVIIO4-II + 6 H2SO4-II 4 MnIISO4-II + 2 K2SO4-II + 5 O20 + 6 H2O-II

This is an oxidation-reduction (redox) reaction:

4 MnVII + 20 e- 4 MnII (reduction)

10 O-II - 20 e- 10 O0 (oxidation)

Change the oxidation states