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Which color fumes we observe when we heat lead nitrate?

Which color fumes we observe when we heat lead nitrate? Correct Answer Brown

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 we heat lead nitrate powder over a bunsen burner, thermal decomposition of the substance takes place.
  • In the process, brown fumes are released, which are of Nitrogen dioxide(NO2). The reaction is:

2Pb(NO3)2 → 2PbO + 4NO2 + O2

  • Hence, when we heat lead nitrate, we observe brown fumes.

Additional Information

  • Cl2 is a greenish-yellow gas.
  • Examples of colorless gases are oxygen, carbon dioxide, sulfur dioxide, ammonia, etc. 

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