Cu2IIAs2VO7 + 10 Zn0 + 10 H2SO4 2 Cu0 + 2 As-IIIH3 + 10 ZnIISO4 + 7 H2O

This is an oxidation-reduction (redox) reaction:

2 CuII + 4 e- 2 Cu0 (reduction)

2 AsV + 16 e- 2 As-III (reduction)

10 Zn0 - 20 e- 10 ZnII (oxidation)

Change the oxidation states