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On strong heating of baking soda, the gas evolved turns lime water milky. What is the name of the remaining solid?

Answer and explanation

Correct answer: Sodium carbonate

Baking soda is sodium hydrogen carbonate, NaHCO₃. On strong heating it undergoes thermal decomposition: 2NaHCO₃ → Na₂CO₃ + CO₂ + H₂O. The evolved carbon dioxide turns limewater milky because calcium carbonate forms, while the solid residue is sodium carbonate. Sodium chloride, calcium sulphate, and ammonium chloride are not products of this decomposition, so option A is correct.

Related tags

Baking SodaThermal DecompositionSodium CarbonateAcidsBasesAnd SaltsAcids Bases And SaltsChemical Substances – Nature And BehaviourChemical Substances Nature And BehaviourScience

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