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Class 10ScienceChemical Substances – Nature and BehaviourAcids, Bases, and SaltsEasy
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A gas evolved by adding acid to a carbonate turns lime water milky. Which gas is it?

Answer and explanation

Correct answer: Carbon dioxide

The governing concept is the acid–carbonate reaction and the limewater test. An acid reacts with a carbonate to form a salt, water, and carbon dioxide; for example, CaCO₃ + 2HCl → CaCl₂ + H₂O + CO₂. When CO₂ is passed through limewater, it forms insoluble calcium carbonate, CaCO₃, which makes the solution milky. Hydrogen, nitrogen, and ammonia do not give this characteristic test. Therefore, option A is correct.

Related tags

CarbonateCarbon DioxideLimewater TestAcidsBasesAnd SaltsAcids Bases And SaltsChemical Substances – Nature And BehaviourChemical Substances Nature And BehaviourScience
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10 more MCQs
  1. 1What type of substance turns blue litmus paper red?
  2. 2What type of substance turns red litmus paper blue?
  3. 3Which of the following substances acts as a natural indicator?
  4. 4What is the general nature of an aqueous soap solution?
  5. 5Which of the following substances turns red litmus paper blue?
  6. 6What is the nature of a solution whose pH is less than 7?
  7. 7At 25°C, a solution with a pH greater than 7 is of which nature?
  8. 8A student dips red litmus paper into a soap solution. What change will occur in the red litmus paper?
  9. 9Which gas is generally produced when dilute acids react with active metals?
  10. 10A student dips red litmus paper into a soap solution. What will be the colour of the litmus paper?
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