Question: Classify each of the following reactions as a combination reaction, decomposition reaction, displacement reaction, or combustion reaction. a. When they are heated, ammonium dichromate crystals,

Classify each of the following reactions as a combination reaction, decomposition reaction, displacement reaction, or combustion reaction.
a. When they are heated, ammonium dichromate crystals, (NH4)2Cr2O7, decompose to give nitrogen, water vapor, and solid chromium(III) oxide, Cr2O3.
b. When aqueous ammonium nitrite, NH4NO2, is heated, it gives nitrogen and water vapor.
c. When gaseous ammonia, NH3, reacts with hydrogen chloride gas, HCl, fine crystals of ammonium chloride, NH4Cl, are formed.

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