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    Question

    Which gas turns lime water

    milky?
    A Oxygen Correct Answer Incorrect Answer
    B Carbon dioxide Correct Answer Incorrect Answer
    C Nitrogen Correct Answer Incorrect Answer
    D Hydrogen Correct Answer Incorrect Answer

    Solution

    Carbon dioxide (COтВВ) turns lime water (Ca(OH)тВВ solution) milky due to the formation of calcium carbonate (CaCOтВГ). This reaction is used as a test for the presence of carbon dioxide. Ca (OH)тВВ + COтВВ тЖТ CaCOтВГ тЖУ + HтВВO The white precipitate of calcium carbonate (CaCOтВГ) causes the milky appearance in lime water. If excess COтВВ is passed, the milky solution turns clear due to the formation of soluble calcium bicarbonate (Ca(HCOтВГ)тВВ).

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