2 NaI-I + MnIVO2 + 3 H2SO4 2 NaHSO4 + I20 + MnIISO4 + 2 H2O

This is an oxidation-reduction (redox) reaction:

MnIV + 2 e- MnII (reduction)

2 I-I - 2 e- 2 I0 (oxidation)

Change the oxidation states