Explain why?
Lime water turns milky, when carbon dioxide gas is passed into it.

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Solution

When $C O_{2}$ passes through lime water, it turns into milky lime water due to formation of insoluble calcium carbonate.
$C a (O H)_{2} + C O_{2} ⇌ C a C O_{3} (+) + H_{2} O$
IOf $C O_{2}$ is passed for longer period, turbidity disappears due to form of soluble calcium bicarbonate.
$C a C O_{3} + H_{2} O + C O_{2} ⇌ C a (H C O_{3})_{2}$ .

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

Statement 1- Lime water turns milky when air is passed through the solution.

Statement 2- Air contains carbon dioxide which turns lime water milky.

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