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Milkiness of lime water is due to which insoluble substance?

Answer and explanation

Correct answer: Calcium carbonate

Lime water contains dissolved calcium hydroxide. When carbon dioxide is passed through it, calcium carbonate forms according to Ca(OH)₂ + CO₂ → CaCO₃ + H₂O. Calcium carbonate is insoluble in water and produces a fine white suspension, which causes the observed milkiness. Therefore option A is correct. Calcium hydrogen carbonate is soluble in water, while sodium chloride and sodium hydroxide do not form the white precipitate responsible for this observation.

Related tags

Lime WaterCalcium CarbonateCarbon Dioxide TestAcidsBasesAnd SaltsAcids Bases And SaltsChemical Substances – Nature And BehaviourChemical Substances Nature And BehaviourScience

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