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Formation of Salts

What visible ...

Question

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

A

Blue color,

C u S O_{4}

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B

Green color,

C u C O_{3}

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C

Milkiness,

C a C O_{3}

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D

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. Calcium carbonate is formed when $C O_{2}$ is passed through it. Calcium carbonate is white in colour and insoluble in water, hence the milkiness.

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