What visible change is observed when $C O_{2}$ is passed through lime water? Which compound in the products is responsible for this change?

Blue color,

C u S O_{4}

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Green color,

C u C O_{3}

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Milkiness,

C a C O_{3}

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Milkiness,

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

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Solution

The correct option is C Milkiness, $C a C O_{3}$
The reaction is:
$C a (O H)_{2} + C O_{2} \to C a C O_{3} + H_{2} O .$
Lime water in calcium hydroxide. Calcium carbonate is formed which is white in colour and insoluble in water, hence the milkiness.

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