Question

Define the term decomposition reaction. Give one example each of thermal decomposition and electrolytic decomposition.

Answer 1

Reaction in which a single reactant breaks down to give simpler products.

Thermal decomposition

CaCO₃+heat  → CaO+CO₂  

Electrolytic decomposition-

2H₂O+ Electric current → 2H₂+O₂  

Detailed Answer:

In a decomposition reaction, a single reactant breaks down into two or more simpler products. When a decomposition reaction is carried out by heating, it is called thermal decomposition reaction.

CaCO₃(s) + heat  → CaO(s) + CO₂(g)

CaCO₃(s)-Calcium carbonate

CaO(s)-Calcium oxide

 CO₂(g)-Carbon dioxide

When a decomposition reaction is carried out with the help of electric current, the process is called electrolysis.

2H₂O(l) + Electric current →2H₂(g) +O₂(g)

2H₂O(l)-Water

2H₂(g)-Hydrogen gas

O₂(g)-Oxygen gas