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How will the gas formed on heating baking soda be confirmed?

Answer and explanation

Correct answer: By lime water turning milky

The governing concept is the thermal decomposition of sodium hydrogen carbonate. On heating, baking soda decomposes as 2NaHCO3 → Na2CO3 + H2O + CO2. The released carbon dioxide is passed through limewater, where it reacts with calcium hydroxide to form insoluble calcium carbonate, making the limewater milky. Hence option A is correct. A pop sound tests hydrogen, while the other indicators do not specifically confirm carbon dioxide.

Related tags

Baking SodaCarbon DioxideLimewater TestAcidsBasesAnd SaltsAcids Bases And SaltsChemical Substances – Nature And BehaviourChemical Substances Nature And BehaviourScience

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