Question

what is decomposition reaction with example

Answer 1

A decomposition reaction is a type of chemical reaction in which a single compound breaks down into two or more elements or new compounds. These reactions often involve an energy source such as heat, light, or electricity that breaks apart the bonds of compounds.Chemical Decomposition Reaction - ThoughtCo

Decomposition Reaction Examples. The electrolysis of water into oxygen and hydrogen gas is an example of a decomposition reaction: 2 H2O → 2 H2 + O2. Another example is the decomposition of potassium chloride into potassium and chlorine gas.

Answer 2

Hello Dear !
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In the decomposition reaction a single compound split into two or more products
For example : Electrolysis of water 
                      CaCO3 --------> CaO + CO2
                                   Heat