3 Zn + 10 H2NO3 → 3 Zn(NO3)2 + 2 (NH4)NO3 + 6 H2O
This is an oxidation-reduction (redox) reaction:
3 Zn0 - 6 e- → 3 ZnII (oxidation)
2 NIV + 14 e- → 2 N-III (reduction)
8 NIV - 8 e- → 8 NV (oxidation)
Zn is a reducing agent, H2NO3 is an oxidizing agent, H2NO3 is a reducing agent.