3 Cl2IO + 10 N-IIIH3 6 N-IIIH4Cl-I + 2 N20 + 3 H2O

This is an oxidation-reduction (redox) reaction:

6 ClI + 12 e- 6 Cl-I (reduction)

4 N-III - 12 e- 4 N0 (oxidation)

Change the oxidation states