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Class 10ScienceChemical Substances – Nature and BehaviourAcids, Bases, and SaltsEasy
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Why does effervescence occur when acid is added to sodium hydrogen carbonate?

Answer and explanation

Correct answer: Carbon dioxide gas is released

The governing concept is the acid–carbonate reaction. When an acid reacts with sodium hydrogen carbonate, the products are a salt, water and carbon dioxide: acid + NaHCO₃ → salt + H₂O + CO₂. The escaping carbon dioxide forms visible bubbles, producing effervescence. Hydrogen is not released, salt vapour is not formed, and freezing water cannot explain the observation. Therefore option A is correct.

Related tags

Sodium Hydrogen CarbonateAcid ReactionEffervescenceCarbon DioxideAcidsBasesAnd SaltsAcids Bases And SaltsChemical Substances – Nature And BehaviourChemical Substances Nature And Behaviour
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  1. 1What type of substance turns blue litmus paper red?
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