This is an oxidation-reduction (redox) reaction:
2 IV + 12 e- → 2 I-I (reduction)
6 O-II - 12 e- → 6 O0 (oxidation)
KIO3 is an oxidizing agent, KIO3 is a reducing agent.
This is a gas evolution reaction, O2 is the formed gas.
Reactants:
Products: