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Which gas is released on heating baking soda and turns lime water milky?

Answer and explanation

Correct answer: Carbon dioxide

The governing concept is thermal decomposition and the confirmatory test for carbon dioxide. On heating, sodium hydrogen carbonate decomposes: 2NaHCO₃ → Na₂CO₃ + H₂O + CO₂. The released carbon dioxide reacts with lime water, calcium hydroxide, to form insoluble calcium carbonate, producing a milky appearance. Thus option A is correct. Hydrogen, oxygen, and ammonia do not arise from this decomposition and do not give this characteristic lime-water test.

Related tags

Baking SodaHeatingCarbon DioxideLime WaterAcidsBasesAnd SaltsAcids Bases And SaltsChemical Substances – Nature And BehaviourChemical Substances Nature And Behaviour

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