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Chemistry miscellaneous
  1. If lime water is kept in the air, it turns milky due to presence of :
    1. Carbondioxide
    2. Nitrogen
    3. Oxygen
    4. Sulphurdioxide
Correct Option: A

Lime water is calcium hydroxide (Ca(OH)2 ). When carbon dioxide is passed into it, it turns milky because of the formation of calcium carbonate: Ca(OH)2 + CO2 ® CaCO3 + H2O


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