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Class 10ScienceChemical Substances – Nature and BehaviourChemical Reactions and EquationsExpert
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When the gas evolved during thermal decomposition of calcium carbonate is passed through lime water, it turns milky. Which gas does this confirm?

Answer and explanation

Correct answer: Carbon dioxide

Thermal decomposition of calcium carbonate produces carbon dioxide: \(\mathrm{CaCO_3 \xrightarrow{\Delta} CaO + CO_2}\). When this gas is passed through lime water, \(\mathrm{Ca(OH)_2}\), it forms an insoluble precipitate of calcium carbonate, making the lime water milky: \(\mathrm{Ca(OH)_2 + CO_2 \rightarrow CaCO_3 \downarrow + H_2O}\). Oxygen does not form a calcium carbonate precipitate under these conditions.

Related tags

Class 10 ScienceChemical ReactionsThermal DecompositionCalcium CarbonateCarbon DioxideLime Water
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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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