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Class 10ScienceChemical Substances – Nature and BehaviourAcids, Bases, and SaltsMedium
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How is carbon dioxide produced in a soda-acid fire extinguisher?

Answer and explanation

Correct answer: By reaction of sodium hydrogen carbonate with acid

A soda-acid extinguisher uses sodium hydrogen carbonate, also called sodium bicarbonate, and an acid such as sulphuric acid. Their reaction produces sodium salt, water, and carbon dioxide: the carbonate or hydrogen carbonate part releases CO₂ when treated with acid. The gas is non-supportive of combustion and helps smother the fire. Thus option A is correct; the other reactions do not produce the required gas.

Related tags

Fire ExtinguisherSodium Hydrogen CarbonateCarbon DioxideAcidsBasesAnd 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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