1,2CrO2- + 3Br2 + 8OH- == 2CrO4/2- + 6Br- + 4H2O2,Cr2O7/2- + 6I- + 14H+ == 2Cr3+ + 3I2 + 7H2O3,CrO4/2- + Ba2+ == BaCrO4↓4,Cr2O7/2- + Ba2+ + H2O == 2BaCrO4↓+2H+
