2 CuIBr-I + 4 H2SVIO4 2 CuIISVIO4 + 2 SIVO2 + 4 H2O + Br20

This is an oxidation-reduction (redox) reaction:

2 Br-I - 2 e- 2 Br0 (oxidation)

2 CuI - 2 e- 2 CuII (oxidation)

2 SVI + 4 e- 2 SIV (reduction)

Change the oxidation states