2 FeN + 2 H2SO4 → 2 H2 + N2 + 2 FeSO4
This is an oxidation-reduction (redox) reaction:
4 HI + 4 e- → 4 H0 (reduction)
2 N-III - 6 e- → 2 N0 (oxidation)
2 FeIII + 2 e- → 2 FeII (reduction)
H2SO4 is an oxidizing agent, FeN is a reducing agent, FeN is an oxidizing agent.