Question

How to do half-reactions to balance the reaction in acid I2 + NO3 arrow IO3 + NO2

Answer 1

identify the oxidation states of each atom in each compound, and then split the reaction into the 2 half-reactions so that you're balancing one at a time
\[I_2 \rightarrow IO_3\]and \[NO_3 \rightarrow NO_2\] looking at this, are you sure you have the right charges? Just asking before we get too far