Oxidising agent = HNO3
Reducing agent = l2
Skeletal equation:
Division into half reactions:
Oxidation half reaction,
Reduction half reaction,
Balancing atoms other than H and O:
Balancing H and O atoms :
l2 + 6H2O ⟶ 2HIO3 + 10H+
HNO3 + H+ ⟶ NO2 + H2O
Balancing the charge on the half reactions by adding electrons and equalising the number of electrons:
l2 + 6H2O ⟶ 2HIO3 + 10H+ + 10e-
10HNO3 + 10H+ + 10e- ⟶ 10NO2 + 10H2O
Add the two half reaction,
l2 + 6H2O + 10HNO3 + 10H+ + 10e- ⟶ 2HIO3 + 10H+ + 10e- + 10NO2 + 10H2O
i.e., l2 + 10HNO3 ⟶ 2HIO3 + 10NO2 + 4H2O