Lime water turns milky when carbon dioxide gas is passed through it due to the formation of _________.

calcium carbonate

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calcium

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calcium dioxide

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water

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Solution

The correct option is A calcium carbonate
When carbon dioxide passed through lime water it turns milky solution. This is due to the insoluble suspension of calcium carbonate ( $C a C O_{3}$ ) formed which is 'white' in colour. Calcium carbonate is insoluble in water and settles to the bottom after some time.

The chemical reaction involved is:

$C a (O H)_{2} (a q) + C O_{2} (g) ⟶ C a C O_{3} (s) + H_{2} O (l)$

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