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A white powder releases heat when mixed with water and forms a milky solution. Passing carbon dioxide through this solution gives a white precipitate. What can the powder be?

Answer and explanation

Correct answer: Quicklime

Quicklime is calcium oxide. It reacts vigorously with water to form slaked lime and release heat: CaO + H₂O → Ca(OH)₂. The resulting limewater becomes milky when carbon dioxide is passed through it because insoluble calcium carbonate forms: Ca(OH)₂ + CO₂ → CaCO₃↓ + H₂O. The combined observations identify quicklime, so option A is correct.

Related tags

QuicklimeLime-WaterCarbon-DioxideAcidsBasesAnd SaltsAcids Bases And SaltsChemical Substances – Nature And BehaviourChemical Substances Nature And BehaviourScience

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