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Class 10ScienceChemical Substances – Nature and BehaviourChemical Reactions and EquationsEasy
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Which is a correct example of a decomposition reaction caused by heating?

Answer and explanation

Correct answer: CaCO₃ → CaO + CO₂ (on heating)

The correct answer is A: CaCO₃ → CaO + CO₂ on heating. A decomposition reaction occurs when one compound breaks into two or more simpler substances. Here, one compound, calcium carbonate, is heated and produces calcium oxide and carbon dioxide, so this is thermal decomposition. Option B is only a change of state: liquid water becomes solid ice, but no new substance is formed. Option C is dissolving sugar in water, a physical change in which sugar remains sugar. Option D changes the shape of iron without producing a new substance. The symbol Δ above the arrow is a useful clue that heat is supplied.

Related tags

Decomposition ReactionThermal DecompositionChemical ReactionsClass 10 ScienceChemical Reactions And EquationsChemical Substances – Nature And BehaviourChemical Substances Nature And BehaviourScience
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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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