Cl₂ (g) + H₂S (g) → 2 HCl (g) + S (s)

This is an oxidation-reduction (redox) reaction:

H₂S is a reducing agent, Cl₂ is an oxidizing agent.

Reactants:

• Cl₂
  • Names: Chlorine , Molecular chlorine
  • Appearance: Greenish-yellow compressed liquefied gas with pungent odour ; Greenish-yellow gas with a pungent, irritating odor. [Note: Shipped as a liquefied compressed gas.]
• H₂S – Hydrogen sulfide
  • Other names: Dihydrogen monosulfide , Dihydrogen sulfide , Sewer gas ... show moreSulfane , Sulfurated hydrogen , Sulfureted hydrogen , Sulfuretted hydrogen , Sulfur hydride , Hydrosulfuric acid , Hydrothionic acid , Thiohydroxic acid , Sulfhydric acid , H2S , Hydrogen sulphide , [SH2] , Hydrogen monosulfide , Sulfide , Zwavelwaterstof , Sulfur hydroxide , Siarkowodor , Idrogeno solforato , Dihydrogen disulfide , Hydrosulfurate , Hepatate , Sour gas , Hepatic gas , Stink dAMP , Hepatic acid , Dihydrogen sulphide show less
  • Appearance: Colorless gas ; Colourless compressed liquefied gas with characteristic odour of rotten eggs ; Colorless gas with a strong odor of rotten eggs. [Note: Sense of smell becomes rapidly fatigued & can NOT be relied upon to warn of the continuous presence of H2S. Shipped as a liquefied compressed gas.]

Products:

• HCl – Chlorane , Hydrogen chloride
  • Other names: Hydrochloric acid , {{Unbulleted list|Muriatic acid , Hydronium chloride ... show moreChlorhydric Acid , Hydrochloric acid gas , HCl , Anhydrous hydrogen chloride , Hydrochloric acid, anhydrous , Aqueous hydrogen chloride , [Note: Often used in an aqueous solution.] show less
  • Appearance: Colorless, transparent liquid, fumes in air if concentrated ; Colorless gas ; Colourless compressed liquefied gas with pungent odour ; Colorless to slightly yellow gas with a pungent, irritating odor. [Note: Shipped as a liquefied compressed gas.]
• S
  • Names: Sulfur , S , Sulphur ... show moreElement 16 , Flowers of sulfur , Flour sulfur , Brimstone show less
  • Appearance: Yellow solid in various forms