Question

In which reaction a compound splits up into two or more simpler substances ?
1. Combination reaction
2. Decomposition reaction
3. Displacement reaction
4. Combustion reaction

Answer 1

Correct Answer - Option 2 : Decomposition reaction

The correct answer is Decomposition reaction.

• Decomposition reaction is a reaction in which a compound splits up into two or more simpler substances.
• The general format of a decomposition reaction is AB --> A + B
• Example: CaCO₃           >  CaO + CO₂
  • In this reaction Calcium carbonate on heating gives Calcium oxide and Carbon dioxide.
• The opposite of decomposition reaction is combination reaction.

Types of chemical reaction	Explanation	General Reaction
Chemical reaction	Two or more compounds combine to form one compound.	A + B → AB
Displacement reaction	One element takes place with another element in the compound.	A + BC → AC + B
Combustion reaction	Oxygen combines with a compound to form carbon dioxide and water.	A + O2 → H2O + CO2