3 C4-IIH10O + CrVIO3 3 C4-3/2H8O + Cr0 + 3 H2O

This is an oxidation-reduction (redox) reaction:

12 C-II - 6 e- 12 C-3/2 (oxidation)

CrVI + 6 e- Cr0 (reduction)

Change the oxidation states