Decomposition reaction Class 10 NCERT

Decomposition reaction: A chemical reaction in which a single reactant breaks down to give smaller products is called a decomposition reaction.

Decomposition Reaction

1. Which of the following is an example of a decomposition reaction?

• 2H2O → 2H2 + O2
• H2 + Cl2 → 2HCl
• NaCl → Na + Cl2
• H2O + CO2 → C6H12O6 + O2

2. What is required for a decomposition reaction to occur?

• Energy (heat, light, or electricity)
• Water
• Oxygen
• None of the above

3. What is the general form of a decomposition reaction?

• AB → A + B
• A + B → AB
• A + B + C → AB
• AB + CD → AC + BD

4. Which of the following is NOT a type of decomposition reaction?

• Thermal decomposition
• Electrolytic decomposition
• Photochemical decomposition
• Synthesis reaction

5. Which compound decomposes into calcium oxide and carbon dioxide upon heating?

• CaCO3
• NaCl
• H2O
• Na2CO3

6. Which of the following represents a decomposition reaction that requires light?

• 2H2O → 2H2 + O2
• 2AgCl → 2Ag + Cl2 (requires light)
• CaCO3 → CaO + CO2
• 2NaCl → 2Na + Cl2