In the detection of carbondioxide gas, lime water turns milky due to the formation of:

C a O

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C a (O H)_{2}

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C a C O_{3}

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

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Solution

The correct option is C $C a C O_{3}$
Carbon dioxide passes through limewater, giving a milky solution. This is due to the insoluble suspension of calcium carbonate formed:
$C a (O H)_{2} (a q) + C O_{2} (g) \to C a C O_{3} (s) + H_{2} O (l)$

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Lime water turns milky when carbon dioxide gas is passed through it due to the formation of _________.

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