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Which gas is produced when sodium hydrogen carbonate NaHCO₃ is heated?

Answer and explanation

Correct answer: Carbon dioxide

On heating, sodium hydrogen carbonate undergoes thermal decomposition: 2NaHCO₃ → Na₂CO₃ + H₂O + CO₂. The gas released is therefore carbon dioxide. It can be identified because it turns limewater milky, although this test is not required to select the answer. Oxygen, hydrogen, and chlorine are not products of this decomposition, so option B is correct.

Related tags

ScienceClass10Acids-Bases-SaltsSodium-Hydrogen-CarbonateThermal-DecompositionCarbon-DioxideAcidsBasesAnd SaltsAcids Bases And Salts

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