Question

What are the types of decomposition reaction, give an example for each.

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Answer

There are three types of decomposition reactions:

  1. Thermal Decomposition:

    • Definition: When a decomposition reaction is carried out by heating, it is called a thermal decomposition reaction.
    • Example: $$ \text{CaCO}_3 \rightarrow \text{CaO} + \text{CO}_2 $$
  2. Photochemical Decomposition:

    • Definition: When the energy of sunlight is used to carry out the decomposition reaction, it is known as photochemical decomposition.
    • Example: $$ 2\text{H}_2\text{O}_2 \rightarrow 2\text{H}_2\text{O} + \text{O}_2 $$
  3. Electrolytic Decomposition:

    • Definition: When an electric current is used to carry out a decomposition reaction, it is called electrolytic decomposition.
    • Example: $$ 2\text{H}_2\text{O} \rightarrow 2\text{H}_2 + \text{O}_2 $$

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