What visible change is observed when $C O_{2}$ is passed through lime water and that change is due to the formation of which compound?

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 is calcium hydroxide. When $C O_{2}$ is passed through lime water, Calcium carbonate is formed which is white in colour and insoluble in water, hence the milkiness.

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