Decomposition reaction is when:

Correct option is B

The correct answer is (B)

A decomposition reaction is a type of chemical reaction in which a single compound breaks down into two or more simpler substances (elements or compounds). This process usually requires energy in the form of heat, light, or electricity.

​$$AB → A + B$$ (Where $$AB$$ is the reactant: a compound) , $$A$$ and $$B$$ are the product (simpler substance)

Applications:

• Used in metallurgy to extract metals.​​
• In the production of oxygen gas.
• Decomposition of carbonates for cement production.

Information Booster:

1. When two or more reactants combine to form one product, it is called a combination reaction. 

$$A + B → AB$$ 

2. When one element displaces another in a compound to form a new product, it is called a displacement reaction. 

​$$A + BC → AC + B$$ 

3. When one reactant breaks down into simpler products with the release of energy, it is called anexothermic decomposition reaction.

$$AB → A + B + energy$$​