6 NO (g) + 4 KOH (aq) → N2 (g) + 4 KNO2 (aq) + 2 H2O (l)
This is an oxidation-reduction (redox) reaction:
2 NII + 4 e- → 2 N0 (reduction)
4 NII - 4 e- → 4 NIII (oxidation)
NO is both an oxidizing and a reducing agent (disproportionation (dismutation)).