4 HNO₃NO₃ + 7 Se + 5 H₂O → 7 H₂SeO₃ + 8 NO

Reactants:

• HNO₃NO₃
• Se
  • Names: Selenium , Se , Selen ... show moreElement 34 , 34Se , Elemental selenium , Selenium alloy show less
  • Appearance: Grey solid in various forms ; Amorphous or crystalline, red to gray solid. [Note: Occurs as an impurity in most sulfide ores.]
• H₂O – Water, oxidane
  • Other names: Water (H2O) , Hydrogen hydroxide (HH or HOH) , Hydrogen oxide ... show moreDihydrogen monoxide (DHMO) (systematic name) , Hydrogen monoxide , Dihydrogen oxide , Hydric acid , Hydrohydroxic acid , Hydroxic acid , Hydrol , Μ-oxido dihydrogen , Κ1-hydroxyl hydrogen(0) show less
  • Appearance: White crystalline solid, almost colorless liquid with a hint of blue, colorless gas

Products:

• H₂SeO₃ – Selenous acid , Selenic(IV) acid
  • Other names: Selenious acid , [SeO(OH)2] , Selenige Säure , Monohydrated selenium dioxide
  • Appearance: White hygroscopic crystals ; Colourless hygroscopic 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.]