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Class 10ScienceChemical Substances – Nature and BehaviourAcids, Bases, and SaltsMedium
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How can the gas formed when dilute acid is added to sodium carbonate be confirmed?

Answer and explanation

Correct answer: By turning lime water milky

An acid reacts with a carbonate to produce a salt, water and carbon dioxide. For example, sodium carbonate with hydrochloric acid gives sodium chloride, water and CO₂. Passing this gas through limewater produces insoluble calcium carbonate, making the limewater milky: Ca(OH)₂ + CO₂ → CaCO₃ + H₂O. Thus option A is correct. The other tests indicate acidic, basic or hydrogen-related behaviour, not carbon dioxide.

Related tags

CarbonateAcid ReactionCarbon DioxideLimewater TestAcidsBasesAnd SaltsAcids Bases And SaltsChemical Substances – Nature And BehaviourChemical Substances Nature And Behaviour
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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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