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Class 10ScienceChemical Substances – Nature and BehaviourAcids, Bases, and SaltsHard
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An unknown solution turns blue litmus red and gives a gas with zinc. When sodium carbonate is added to the same solution, another gas is released. What is the correct identification of both gases?

Answer and explanation

Correct answer: Hydrogen from zinc and carbon dioxide from carbonate

Blue litmus turning red establishes that the unknown solution is acidic. Acids react with zinc, an active metal, to form a salt and hydrogen gas: acid + Zn → salt + H2. The same acid reacts with sodium carbonate to form a salt, water, and carbon dioxide: acid + carbonate → salt + H2O + CO2. Therefore option A correctly identifies the two gases.

Related tags

Acid ReactionsZincCarbonateGas TestsAcidsBasesAnd 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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