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Class 10ScienceChemical Substances – Nature and BehaviourChemical Reactions and EquationsMedium
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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.

Related tags

ScienceClass10Thermal-DecompositionCalcium-CarbonateChemical-EquationsChemical Reactions And EquationsChemical Substances – Nature And BehaviourChemical Substances Nature And Behaviour
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10 more MCQs
  1. 1What is the process called when one or more substances form new substances with different properties?
  2. 2Which of the following observations can be a common sign that a chemical reaction has occurred?
  3. 3What are the substances written on the left side of the arrow in a chemical equation called?
  4. 4What are the substances written on the right side of the arrow in a chemical equation called?
  5. 5Balancing a chemical equation is based on which law?
  6. 6What must be the same on the reactant and product sides of a balanced chemical equation?
  7. 7When two or more reactants combine to form a single product, what type of reaction is it?
  8. 8Calcium oxide reacts with water to form calcium hydroxide. What type of reaction is this?
  9. 9When a compound breaks down into two or more simpler substances, what type of reaction is it?
  10. 10When calcium carbonate is heated, it forms calcium oxide and carbon dioxide. What type of reaction is this?
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