When calcium carbonate is heated a solid and a gas are formed. What type of reaction is this?
Answer and explanation
Correct answer: Thermal decomposition
On heating, calcium carbonate decomposes according to CaCO₃ → CaO + CO₂. A single compound breaks into two simpler products: solid calcium oxide and gaseous carbon dioxide. Since heat is supplied to cause the breakdown, the reaction is specifically called thermal decomposition. It is not combination, because one product is not formed, and no exchange or displacement of ions occurs.
Frequently asked questions
What is the correct answer to this question?
Thermal decomposition
Why is this the correct answer?
On heating, calcium carbonate decomposes according to CaCO₃ → CaO + CO₂. A single compound breaks into two simpler products: solid calcium oxide and gaseous carbon dioxide. Since heat is supplied to cause the breakdown, the reaction is specifically called thermal decomposition. It is not combination, because one product is not formed, and no exchange or displacement of ions occurs.
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.
