Why do the gas released when metal bicarbonates react with acid turns lime water milky?

Formation of calcium hydrogen carbonate

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Precipitation of calcium hydrogen carbonate

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Formation of white calcium carbonate precipitate

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Solution

The correct option is C Formation of white calcium carbonate precipitate
When metal bicarbonates react with acid liberates carbon dioxide The gas evolved because of reaction of acid with metal carbonate or metal hydrogen carbonate turns lime water milky. This shows that the gas is carbon dioxide gas. This happens because of formation of white precipitate of calcium carbonate.
$C a {(O H)}_{2} + C O_{2} \Rightarrow C a C O_{3} + H_{2} O$ .

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Why does $C O_{2}$ turn lime water milky?

on adding $N a H C O_{3}$ to acetic acid, a gas is evolved which turns lime water milky due to the formation of:

C O_{2}

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