4 NH₃ (g) + Cl₂ (g) → N₂H₄ (l) + 2 NH₄Cl (s)

This is an oxidation-reduction (redox) reaction:

Cl₂ is an oxidizing agent, NH₃ is a reducing agent.

Reactants:

• NH₃
  • Names: Ammonia , Azane (only intended for use in naming derivatives of ammonia) , Hydrogen nitride ... show moreAmmonia (anhydrous) , Azane , NH3 , Trihydrogen nitride , R717 , Refrigerant gas 717 , Anhydrous ammonia , Aqua ammonia , Aqueous ammonia , [Note: Often used in an aqueous solution.] show less
  • Appearance: Colourless gas ; Colourless gas or compressed liquefied gas with pungent odour ; Colorless gas with a pungent, suffocating odor. [Note: Shipped as a liquefied compressed gas. Easily liquefied under pressure.]
• 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.]

Products:

• N₂H₄ – Hydrazine
  • Other names: Diamine; , Diazane , Tetrahydridodinitrogen ... show moreDiamine , H2NNH2 , N2H4 , Nitrogen hydride , Hydrazin , Diamide , (anhydrous) , Hydrazine (anhydrous) , Hydrazine base show less
  • Appearance: Colorless, fuming, oily liquid ; Colourless fuming oily hygroscopic liquid with pungent odour ; Colorless, fuming, oily liquid with an ammonia-like odor. [Note: A solid below 36°F.]
• NH₄Cl – Ammonium chloride
  • Other names: Sal ammoniac , Salmiac , Nushadir salt ... show moreSal armagnac , Salt armoniack , Salmiak , Ammonium chloride fume , Amchlor , Ammoneric , Ammonium muriate , Darammon , Sal ammonia , Salammonite , [NH4]Cl , NH4Cl , Ammoniumchlorid , Azanium chloride , Ammonium muriate fume , Sal ammoniac fume show less
  • Appearance: White solid, hygroscopic ; Odourless colourless-to-white hygroscopic solid in various forms ; Finely divided, odorless, white particulate dispersed in air.