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Class 10ScienceChemical Substances – Nature and BehaviourChemical Reactions and EquationsExpert
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The gas produced on heating calcium carbonate turns lime water milky. Which gas is it?

Answer and explanation

Correct answer: Carbon dioxide

Calcium carbonate undergoes thermal decomposition on heating to form calcium oxide and carbon dioxide: \(\mathrm{CaCO_3 \xrightarrow{\Delta} CaO + CO_2}\). The released \(\mathrm{CO_2}\) reacts with lime water, \(\mathrm{Ca(OH)_2}\), forming insoluble calcium carbonate: \(\mathrm{CO_2 + Ca(OH)_2 \rightarrow CaCO_3 \downarrow + H_2O}\). This precipitate makes the lime water appear milky. Oxygen does not form this precipitate with lime water.

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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