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Class 10ScienceChemical Substances – Nature and BehaviourChemical Reactions and EquationsMedium
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Ten grams of calcium carbonate is heated in a closed container. If no gas escapes, what will be the total mass of the products?

Answer and explanation

Correct answer: Ten grams

On heating, calcium carbonate decomposes according to the reaction CaCO₃ → CaO + CO₂. Although carbon dioxide is produced, the container is closed, so this gas remains inside and is included in the measured products. The law of conservation of mass therefore gives: total mass of products = total mass of reactant = 10 g. Hence option A is correct; the other values incorrectly assume mass is lost, doubled, or absent.

Related tags

ScienceClass10Conservation-Of-MassThermal-DecompositionClosed-ContainerChemical 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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