3 H2O2-I + 2 CrIIICl3 + 10 NaO-IIH 2 Na2CrVIO4-II + 6 NaCl + 8 H2O-II

This is an oxidation-reduction (redox) reaction:

6 O-I + 6 e- 6 O-II (reduction)

2 CrIII - 6 e- 2 CrVI (oxidation)

H2O2 is an oxidizing agent, CrCl3 is a reducing agent.