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Class 10ScienceChemical Substances – Nature and BehaviourChemical Reactions and EquationsMedium
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When calcium carbonate is heated, the gas produced turns limewater milky. Which gas is it?

Answer and explanation

Correct answer: Carbon dioxide

Heating calcium carbonate causes thermal decomposition: CaCO₃ → CaO + CO₂. The released carbon dioxide reacts with calcium hydroxide in limewater to form insoluble calcium carbonate, producing a milky appearance: CO₂ + Ca(OH)₂ → CaCO₃ + H₂O. Thus option C is correct. Oxygen, hydrogen, and nitrogen do not give this characteristic limewater test under these conditions.

Related tags

ScienceClass10Thermal-DecompositionCarbon-DioxideLimewater-TestChemical 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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