What is the visible change observed when $C O_{2}$ is passed through lime water? This 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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Milky,

C a C O_{3}

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Milky,

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

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Solution

The correct option is C Milky, $C a C O_{3}$
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. Lime water reacts with carbon dioxide to form calcium carbonate (white in colour). $C a C O_{3}$ is insoluble in water, and hence lime water turns milky.

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