K2Cr2O7 + 2 NH4Cl → 4 H2O + 2 KCl + N2 + Cr2O3

This is an oxidation-reduction (redox) reaction:

2N-III-6e-→2N0(oxidation)

2CrVI+6e-→2CrIII(reduction)

NH4Cl is a reducing agent, K2Cr2O7 is an oxidizing agent.

This is a precipitation reaction: Cr2O3 is the formed precipitate.

This is a gas evolution reaction, N2 is the formed gas.

Reactants:

• K2Cr2O7 – Potassium dichromate(VI)
  • Other names: Potassium dichromate , Chromium potassium oxide , Dipotassium dichromium heptaoxide ... show moreDipotassium dichromate , Dipotassium bichromate , Dichromic acid dipotassium salt , Dipotassium dichromate (VI) , Dichromic acid, dipotassium salt , Potassium bichromate show less
  • Appearance: Red-orange crystalline solid ; Orange-to-red crystals
• 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.

Products:

• 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
• KCl
  • Names: Potassium chloride , Sylvite , Muriate of potash ... show moreKlor-Con M15 , K-Lease , Klor-Con 8 , K+10 , K+8 , Klor-Con M10 , Micro-K 10 , Kato , Kaon Cl-10 , Kaon-Cl , Kaon Cl , Micro-K , Klor-Con 10Meq , Klor-Con 10 , Micro-K Ls , K-dur , Klor-Con , Klor-Con M20 , Slow-K , Ten-K , Klotrix , [KCl] , Kaliumchlorid , Chloride of potash , Kaon-CL 10 , Klor-CON , KCl , Monopotassium chloride , K-Tab , Chlorid draselny , Potassium Chloride show less
  • Appearance: White crystalline solid ; Colourless hygroscopic crystals
• N2
  • Names: Dinitrogen , Nitrogen (compressed gas) , Nitrogen (liquified) ... show moreN₂ , Nitrogen gas , N2 , Nitrogen , Diazyne , Liquid nitrogen , Nitrogen (refrigerated liquid) , Nitrogen (cryogenic liquid) show less
  • Appearance: Odourless colourless compressed gas ; Odourless colourless extremely cold liquid
• Cr2O3
  • Names: Chromium(III) oxide , Chromium sesquioxide , Chromia ... show moreChrome green , Eskolaite , Dichromium trioxide , Chromium(iii) oxide , Green oxide of chromium , Green chromium oxide , Chromium(III) sesquioxide , Chromic oxide show less
  • Appearance: Light to dark green, fine crystals ; Light-to-dark-green powder