Respuesta :

sulfur dioxide
2SO₂ + O₂ + 2H₂O → 2H₂SO₄

nitrogen dioxide
4NO₂ + O₂ + 2H₂O → 4HNO₃

chlorine
Cl₂ + H₂O → HCl + HClO
2HClO → 2HCl + O₂

and many others