Question

WHen the gas formed on heating lime dtone is passed through freshly prepared lime water the lime water turns milky

Answer 1

Lime stone is CaCO3.

Heating CaCO3 --> CaO + CO2

Lime water is Ca(OH)2, on addition of CO2 a milky white precipitate is formed

Ca(OH)2 + CO2 = CaCO3 + H2O

Answer 2

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Carbon dioxide turns freshly prepared lime water milky.