10 KNO₃ + Cr₂S₃ → 3 K₂SO₄ + 10 NO + 2 K₂CrO₄

This is an oxidation-reduction (redox) reaction:

Cr₂S₃ is a reducing agent, KNO₃ is an oxidizing agent, Cr₂S₃ is a reducing agent.

Reactants:

• KNO₃ – Potassium nitrate
  • Other names: Saltpeter , Saltpetre , Nitrate of potash ... show moreNitric acid, potassium salt , Niter , Salt peter , Nitre show less
  • Appearance: White solid ; Colourless-to-white crystalline powder
• Cr₂S₃
  • Names: Chromium(III) Sulfide , Chromium(III) sulfide
  • Appearance: Brown to black powder

Products:

• K₂SO₄
  • Names: Potassium sulfate , Potassium sulphate , Dipotassium sulfate ... show moreKaliumsulfat , K2SO4 , Sulfuric acid dipotassium salt show less
  • Appearance: White solid ; Colourless-to-white crystals
• 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.]
• K₂CrO₄ – Potassium chromate
  • Other names: Chromic acid , (K2CrO4) , Dipotassium salt ... show moreDipotassium chromate , Potassium chromate(VI) , Bipotassium chromate , Chromic acid, dipotassium salt , Dipotassium monochromate show less
  • Appearance: Yellow powder ; Yellow crystals