Question: Balance the following reactions by the oxidation number method.

Question

a) I2 + HNO3 --> HIO3 + NO2 + H2O

so i have
N +5 to +4 net charge = -1
I 0 to +5 net charge = +5

i add coefficient where the oxidation number is changing.

in this case
I2 + 10HNO3 --> 2HIO3 + 10NO2 + H2O

i cant balance now.