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On heating ammonium dichromate and barium azide separately we get:

On heating ammonium dichromate and barium azide separately we get: Correct Answer N<sub>2</sub> in both cases

Concept:

Decomposition reaction:

  • Those reactions in which a compound splits up into two or more simpler substances are known as decomposition reactions.
  • The decomposition reactions are carried out by applying heat, light or electricity.
  • Heat, light, or electricity provide energy that breaks a compound into two or more simpler compounds. 
  • A decomposition reaction is the opposite of a combination reaction. 

The types of decomposition reaction are:

Thermal decomposition:

  • When a decomposition reaction is carried out by heating, it is called thermal decomposition.

Example: CaCO3 → CaO + CO2

  • When limestone (CaCO3 ) is heated then it changed to Quick lime (CaO) and carbon dioxide gas.      

Electrolytic decomposition:

  • When current passed through an aqueous solution of a substance it breaks down into ions.

Example: 2H2O → 2H2 + O2

Photo decomposition reaction:

  • When a compound is broken down by photons or absorption of light, it is called a photodecomposition reaction.

Example: 2AgCl → 2Ag + Cl2

Explanation:

  • When he heat ammonium dichromate, (NH4)2Cr2O7 it decomposes to give the following products:

(NH4)2Cr2O7 → 4H2O + N2 + Cr2O3

  • When Barium azide decomposes, it gives :

Ba(N3)2 → Ba + 3N2

  • Both Ammonium dichromate and Barium azide decompose to give Nitrogen.

Hence, on heating ammonium dichromate and barium azide separately we get N2 in both cases.

Important Points

  •  N2O is produced via the decomposition of ammonium nitrate.

NH4NO3 → N2O + 2H2O

  • NO2 is produced by heating nitrates of heavy metals such as lead.

​Pb(NO3)2 → NO2 + PbO + O2

Related Questions

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