Give 5 day to day real life example of decomposition reaction

Solution: 

Decomposition reaction: A reaction in which a complex reactant is converted into two or more simple molecules, then the reaction is called a decomposition reaction.

In other words, decomposition reaction is the separation of a substance into two or more simple substances which have different properties from each other and that of the original substance.

Ex: AB ---> A + B 

Daily life examples of decomposition reactions are as follows- 

1) When you open a fresh soda, the fizzing reaction that occurs is the result of a decomposition reaction:

H₂CO₃ → H₂O+CO₂

2) When Calcium carbonate is heated, it decomposes to give calcium oxide and carbon dioxide gas.

Reaction : CaCO₃ →CaO + CO₂

3) 2NaHCO₃ → Na₂CO₃ + CO₂ + H₂O
The above reaction occurs when someone takes an antacid.

4) 2H₂O₂ → 2H₂O + O₂ (g)
The above reaction takes place in the atmosphere.

5)  2 H₂O → 2 H₂ + O₂
The above reaction occurs when electric current is passes through the water.