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Virat
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Asked: 2025-09-27T03:58:32+00:00 In:

When excess of carbon dioxide is passed through lime water, the milkiness disappears because [A] water soluble calcium carbonate converts to water soluble calcium bicarbonate. [B] insoluble calcium carbonate converts to water soluble calcium bicarbonate. [C] water soluble calcium carbonate converts to insoluble calcium bicarbonate. [D] insoluble calcium carbonate converts to insoluble calcium bicarbonate.

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The correct answer is [B]. When excess carbon dioxide is passed through lime water, the initially formed insoluble calcium carbonate reacts further with CO₂ and water to form water-soluble calcium bicarbonate, causing the milkiness in lime water to disappear.

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    1 Answer

    1. ANSWER: [B]

      Explanation: When CO₂ is first passed through lime water, Ca(OH)₂ reacts to form insoluble CaCO₃, which makes the solution milky. On passing excess CO₂, the CaCO₃ dissolves forming soluble Ca(HCO₃)₂, causing the milkiness to disappear.

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