$C O_{2}$ turns lime water milky, due to the formation of :

C a (H C O_{3})_{2}

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C a C O_{3}

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C a (O H)_{2}

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C a O

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Solution

The correct option is B $C a C O_{3}$
When you pass carbon dioxide through this solution, the two compounds carbon dioxide ( $C O_{2}$ ) and calcium hydroxide $C a (O H)_{2}$ will react to form white and insoluble calcium carbonate which precipitates out of the solution.
The reaction is as follow:

$C a (O H)_{2} + C O_{2} \to C a C O_{3} ↓ + H_{2} O$

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