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GK QUESTION#3368

When carbon dioxide gas is bubbled through freshly prepared lime water, what is the nature of the precipitate formed?

  1. AYellow precipitate
  2. BBrown precipitate
  3. CBlack precipitate
  4. DWhite precipitateCorrect answer
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Answer

D. White precipitate

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Explanation

Carbon dioxide initially reacts with calcium hydroxide in limewater to form insoluble white calcium carbonate: CO₂ + Ca(OH)₂ → CaCO₃(s) + H₂O. The suspended precipitate makes the liquid look milky. With sufficient excess CO₂, the carbonate can dissolve as aqueous calcium hydrogencarbonate: CaCO₃ + CO₂ + H₂O → Ca(HCO₃)₂.

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