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Which gas is formed when baking soda is heated?

Answer and explanation

Correct answer: Carbon dioxide

Baking soda is sodium hydrogen carbonate, NaHCO₃. On heating, it undergoes thermal decomposition: 2NaHCO₃ → Na₂CO₃ + H₂O + CO₂. Thus, carbon dioxide is released as the gas. The water formed is vapour, while sodium carbonate remains as a solid; no hydrogen, oxygen or nitrogen is produced in this reaction. Therefore, option A is correct.

Related tags

Baking SodaThermal DecompositionCarbon DioxideSodium Hydrogen CarbonateChemical ReactionsAcidsBasesAnd SaltsAcids Bases And SaltsChemical Substances – Nature And Behaviour

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