2 KIVO3 + 10 HI-I + H2SO4 6 I20 + K2SO4 + 6 H2O

This is an oxidation-reduction (redox) reaction:

10 I-I - 10 e- 10 I0 (oxidation)

2 IV + 10 e- 2 I0 (reduction)

Change the oxidation states