C6-IH5NO2 + 3 Fe0 + 7 HCl C6-IIH5NH3Cl + 3 FeIICl2 + 2 H2O

This is an oxidation-reduction (redox) reaction:

6 C-I + 6 e- 6 C-II (reduction)

3 Fe0 - 6 e- 3 FeII (oxidation)

Change the oxidation states