Which gas is produced when calcium carbonate is heated?
Answer and explanation
Correct answer: Carbon dioxide
On heating, calcium carbonate undergoes thermal decomposition. The balanced reaction is CaCO₃ → CaO + CO₂, with heat supplied as the condition. The gaseous product is therefore carbon dioxide, so option C is correct. Calcium oxide remains as the solid product. Hydrogen, oxygen, and nitrogen are not formed in this decomposition because none appears among the products of the balanced equation.
Frequently asked questions
What is the correct answer to this question?
Carbon dioxide
Why is this the correct answer?
On heating, calcium carbonate undergoes thermal decomposition. The balanced reaction is CaCO₃ → CaO + CO₂, with heat supplied as the condition. The gaseous product is therefore carbon dioxide, so option C is correct. Calcium oxide remains as the solid product. Hydrogen, oxygen, and nitrogen are not formed in this decomposition because none appears among the products of the balanced equation.
Which subject and chapter does this question cover?
This is a Class 10 Science question. Chapter: Chemical Substances – Nature and Behaviour. Topic: Chemical Reactions and Equations.
