N₂O₄ + HMnO₄ + NO → Mn(NO₃)₂ + HNO₃

This is an oxidation-reduction (redox) reaction:

HMnO₄ is an oxidizing agent, NO is a reducing agent, N₂O₄ is a reducing agent.

Reactants:

• N₂O₄ – Dinitrogen tetraoxide
  • Other names: Dinitrogen tetroxide , [N(NO2)O2] , Nitrogen tetroxide ... show moreO2NNO2 , N2O4 show less
  • Appearance: Colourless liquid, orange gas
• HMnO₄
  • Names: Permanganic acid , Manganic(VII) acid , HMnO4 , [MnO3(OH)]
• NO – Nitrogen monoxide , Oxidonitrogen(•) (additive)
  • Other names: Nitric oxide , Nitrogen(II) oxide , Nitric oxide (radical) ... show moreMononitrogen monoxide , (.)NO , EDRF , Nitrogen monooxide , [NO] , Oxido de nitrogeno(ii) , NO(.) , Oxido nitrico , Stickstoff(ii)-oxid , NO , Oxyde azotique , Oxyde nitrique , Stickstoffmonoxid , Nitrosyl , (NO)(.) , Monoxido de nitrogeno , Endothelium-derived relaxing factor , Nitroxide radical , Nitroxyl , Nitrosyl radical , Hydroxyamine , Nitrogen oxide , Nitrogen protoxide , Nitrosyl hydride , Nitric Oxide show less
  • Appearance: Colourless gas ; Colourless compressed gas ; Colorless gas. [Note: Shipped as a nonliquefied compressed gas.]

Products:

• Mn(NO₃)₂ – Manganese(II) nitrate
  • Other names: Manganese dinitrate , Manganese nitrate
  • Appearance: White powder
• HNO₃ – Nitric acid
  • Other names: Aqua fortis , Spirit of niter , Eau forte ... show moreHydrogen nitrate , Acidum nitricum , Nitric acid (> 70% in water) , Fuming nitric acid , Engravers acid , HONO2 , Red fuming nitric acid , RFNA , White fuming nitric acid (WFNA) show less
  • Appearance: Colorless, yellow or red fuming liquid ; Colourless-to-yellow liquid with pungent odour ; Colorless, yellow, or red, fuming liquid with an acrid, suffocating odor. [Note: Often used in an aqueous solution. Fuming nitric acid is concentrated nitric acid that contains dissolved nitrogen dioxide.]