What is the role of heat in thermal decomposition of calcium carbonate?
Answer and explanation
Correct answer: Heat is the energy that drives the reaction
Thermal decomposition requires an input of energy to break the bonds in calcium carbonate. On heating, calcium carbonate decomposes as CaCO₃ → CaO + CO₂, so heat supplies the activation energy and is written over the reaction arrow as a condition, not as a product. Hence option B is correct. The products are calcium oxide and carbon dioxide, not heat or a precipitate formed by heat.
Frequently asked questions
What is the correct answer to this question?
Heat is the energy that drives the reaction
Why is this the correct answer?
Thermal decomposition requires an input of energy to break the bonds in calcium carbonate. On heating, calcium carbonate decomposes as CaCO₃ → CaO + CO₂, so heat supplies the activation energy and is written over the reaction arrow as a condition, not as a product. Hence option B is correct. The products are calcium oxide and carbon dioxide, not heat or a precipitate formed by heat.
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.
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