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Class 10ScienceChemical Substances – Nature and BehaviourChemical Reactions and EquationsMedium
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In which reaction must heat energy be supplied for the reaction to occur?

Answer and explanation

Correct answer: Heating calcium carbonate

The governing concept is the energy change in a chemical reaction. Calcium carbonate undergoes thermal decomposition only when heated: CaCO3 + heat → CaO + CO2. Therefore, heat is a reactant and must be supplied, making option B correct. Adding water to calcium oxide, burning fuel, and respiration are generally exothermic processes that release heat rather than require continuous heat input.

Related tags

ScienceClass 10Chemical ReactionsThermal DecompositionEndothermic ReactionChemical 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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