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Class 10ScienceChemical Substances – Nature and BehaviourAcids, Bases, and SaltsMedium
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If dilute acid is added to both sodium carbonate and sodium hydrogen carbonate, which test will give the same result?

Answer and explanation

Correct answer: The evolved gas will turn lime water milky

Both sodium carbonate, Na₂CO₃, and sodium hydrogen carbonate, NaHCO₃, react with a dilute acid to release carbon dioxide. The reactions differ in their salt and water products, but the gas test is the same: CO₂ turns limewater milky because insoluble calcium carbonate forms. Thus option A is correct. A pop sound identifies hydrogen, not carbon dioxide, and chlorine is not produced here.

Related tags

CarbonateBicarbonateLime Water 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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