Balance the following redox equations by the ion-electronmethod:
(a) H2O2 + Fe2+ -> Fe3+ + H2O (in acidic solution)
(b) Cu + HNO3 -> Cu2+ + NO + H2O (in acidicsolution)
(c) CN- + MnO4- -> CNO- + MnO2 (in basic solution)
(d) Br2 -> BrO3- + Br- (in basic solution)
(e) S2O3 2- + I2 -> I- + S4O6 2- (in acidic solution)