5 Te0 + 6 HClVO3 + 12 H2O 5 H6TeVIO6 + 3 Cl20

This is an oxidation-reduction (redox) reaction:

5 Te0 - 30 e- 5 TeVI (oxidation)

6 ClV + 30 e- 6 Cl0 (reduction)

Change the oxidation states