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Class 10ScienceChemical Substances – Nature and BehaviourAcids, Bases, and SaltsEasy
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Why are bubbles formed when baking soda is added to lemon juice?

Answer and explanation

Correct answer: Carbon dioxide forms from reaction between lemon acid and baking soda

Lemon juice contains citric acid, while baking soda is sodium hydrogen carbonate, NaHCO₃. An acid reacting with a hydrogen carbonate produces a salt, water, and carbon dioxide: acid + hydrogen carbonate → salt + H₂O + CO₂. The carbon dioxide escapes as visible bubbles or fizz. No metal is formed, and the observation itself proves that a reaction occurs, so option A is correct.

Related tags

Baking SodaLemon JuiceCarbon DioxideAcid ReactionAcidsBasesAnd 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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