6 KMnVIIO4 + 10 NIIO + 9 H2SO4 10 HNVO3 + 6 MnIISO4 + 3 K2SO4 + 4 H2O

This is an oxidation-reduction (redox) reaction:

6 MnVII + 30 e- 6 MnII (reduction)

10 NII - 30 e- 10 NV (oxidation)

KMnO4 is an oxidizing agent, NO is a reducing agent.