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Class 10ScienceChemical Substances – Nature and BehaviourChemical Reactions and EquationsMedium
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Which is the correct pair of solid residue and gas in decomposition of calcium carbonate?

Answer and explanation

Correct answer: Calcium oxide and carbon dioxide

The thermal decomposition equation is CaCO₃(s) → CaO(s) + CO₂(g). Calcium oxide remains behind as the solid residue, while carbon dioxide escapes as a gas. The products are determined by the composition of the carbonate: the calcium forms the oxide and the carbonate part releases carbon dioxide. Hydroxide, sulphate, chloride, hydrogen, oxygen, and nitrogen are not products of this reaction.

Related tags

ScienceClass10Chemical-ReactionsCalcium-CarbonateCarbon-DioxideChemical 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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