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Home » Class 10 » Chemical Reaction and equation » Decomposition Reaction

Decomposition Reaction

Last Updated on February 16, 2023 By Mrs Shilpi Nagpal

Question 1 What are decomposition reactions?

Question 2 What happens when ferrous sulphate crystals are decomposed?

Question 3 What is electrolysis?

Question 4 What is photochemical decomposition. Give example?

Decomposition Reaction

Those reactions in which a compound split up into two or more simpler substances are called as decomposition reaction. They are carried out by applying heat, light, electricity.

For Example:

       CaCO3 (s)           →              CaO (s) + CO2 (g)
Limestone                 Heat            (Quick lime)

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


2FeSO4(s)       →   Fe2O3(s)   +  SO2(g)   +   SO3(g)
Ferrous Sulphate                Ferric oxide         Sulphur dioxide      Sulphur trioxide

 

A smell of burning sulphur is obtained due to the formation of sulphur dioxide gas. When the decomposition is carried out by electricity, it is called electrolysis.

2H2O(l)                    →                   2H2(g)        + O2(g)
  Water              electricity decomposition                 Hydrogen                 Oxygen
 

 

2 Al2O3 (cryolite) → 4 Al (s) + 3 O2 (g)

 

When decomposition reaction is carried out by light it is called Photochemical decomposition.

 

        2AgBr(s)           →        2Ag(s) +Br2(g)
Light Yellow          Sunlight             Grey

 

2AgCl(s)    →       2Ag(s) + Cl2(g)
White                             Grey

 

         2H202(l)           →          2H20(l) + O2(g)
Light

 

The digestion of food in our body is an example of decomposition reaction.

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Filed Under: Chemical Reaction and equation, Class 10 Tagged With: decomposition reaction, electrolysis, photochemical decomposition, thermal decomposition

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Comments

  1. Mayuri Lad says

    December 29, 2020 at 10:44 pm

    Thank shilpi
    Your notes has been really of immense help as it has cleared my doubts with your examples in daily life. Thank you Shilpi mam

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