Question

What is decomposition reaction.

Answer 1

Answer:

A reaction in which a compound splits up into two or more simpler substances is known as a decomposition reaction.

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Explanation:

Answer 2

A decomposition reaction is one where a compound breaks down into its constituent compounds or elements.
Decomposition reactions occur under heat, light and electricity.
For example:
With heat(thermal decomposition)
2HgO ——-> 2Hg+O2

Mercuric oxide decomposes in the presence of heat to form Mercury and Oxygen