5 HOClI + I20 + H2O 2 HIVO3 + 5 HCl-I

This is an oxidation-reduction (redox) reaction:

5 ClI + 10 e- 5 Cl-I (reduction)

2 I0 - 10 e- 2 IV (oxidation)

HOCl is an oxidizing agent, I2 is a reducing agent.