12 HNO + Zn → Zn(NO3)2 + 5 N2 + 6 H2O
This is an oxidation-reduction (redox) reaction:
Zn0 - 2 e- → ZnII (oxidation)
10 NI + 10 e- → 10 N0 (reduction)
2 NI - 8 e- → 2 NV (oxidation)
Zn is a reducing agent, HNO is an oxidizing agent, HNO is a reducing agent.