C6-IH5NO2 + 2 Fe0 + 6 HCl C6-IIH5NH2 + 2 FeIIICl3 + 2 H2O

This is an oxidation-reduction (redox) reaction:

6 C-I + 6 e- 6 C-II (reduction)

2 Fe0 - 6 e- 2 FeIII (oxidation)

Change the oxidation states