When the gas formed on heating limestone is passed through freshly prepared lime water, the lime water turns milky.

When the gas formed on heating limestone is passed through freshly pre

1.	When the gas formed on heating limestone is passed through freshly prepared lime water, the lime water turns milky.
Answer» (i) On heating, limestone undergoes thermal decomposition to form calcium oxide (quick lime) and carbon dioxide. `CaCO_(3(s))overset(Delta)tounderset("quick lime")(CaO_((s)))+CO_(2)uarr` (ii) Calcium oxide when dissolved in water forms Calcium hydroxide (lime water). `CaO_((s))+H_(2)O_((l))to underset("Calcium hydroxide")(Ca(OH)_(2(aq)))` (iii) When carbon dioxide is passed through lime water it turns milky due to formation of white precipitate of Calcium carbonate. `Ca(OH)_(2(aq))+CO_(2(g))to underset("Calcium carbonate")(CaCO_(3(s)))+H_(2) O_((l))`

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When the gas formed on heating limestone is passed through freshly prepared lime water, the lime water turns milky.

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