Balance the following redox reactions by ion-electron method:
(a)
(aq) + I–
(aq) → MnO2
(s) + I2(s)
(in basic medium)
(b)
(aq) + SO2
(g) → Mn2+
(aq) +
(aq) (in acidic solution)
(c) H2O2 (aq) + Fe2+ (aq) → Fe3+ (aq) + H2O (l) (in acidic solution)
(d)
+ SO2(g)
→ Cr3+
(aq) +
(aq)
(in acidic solution)