Video: A specific test for chromate and dichromate ion
Cr2O72-(aq) + 3 H2O(l) ® 2 CrO(O2)2(ether) + 6 H+(aq) + 8 e- H2O2(aq) + 2 H+(aq) + 2 e- ® 2 H2O(l)