Question

balance the redox reaction. : Cr2O2- 7(aq) + Fe2+(aq) ------H+------> Cr3+ (aq) + Fe3+(aq)

Answer 1

Fe2+ + Cr2O72- + H+ → Fe3+ + Cr3+ + H2O ... A redox reaction is nothing but both oxidation and reduction reactions ... a) Balance all other atoms except hydrogen and oxygen.

Answer 2

3Cr2O2-7(aq) +3Fe2+(aq) +H--->2Cr3+7(aq) +2Fe3+(aq)