The gas which turns lime water milky is

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(C) Lime water is a solution of calcium hydroxide,$Ca(OH)_2$. When carbon dioxide $(CO_2)$ is passed through lime water,it forms an insoluble precipit

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(C) Lime water is a solution of calcium hydroxide,$Ca(OH)_2$. When carbon dioxide $(CO_2)$ is passed through lime water,it forms an insoluble precipitate of calcium carbonate $(CaCO_3)$,which turns the solution milky: $Ca(OH)_2(aq) + CO_2(g) \rightarrow CaCO_3(s) + H_2O(l)$. Similarly,sulfur dioxide $(SO_2)$ also reacts with lime water to form calcium sulfite $(CaSO_3)$,which is also an insoluble white precipitate,turning the solution milky: $Ca(OH)_2(aq) + SO_2(g) \rightarrow CaSO_3(s) + H_2O(l)$. Therefore,both gases turn lime water milky.

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