Give the characteristic test for $C O_{2}$ gas.

Turns lime water colourless

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Turns lime water blue

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Turns lime water milky

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Turns lime water black

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Solution

The correct option is B Turns lime water milky
Characteristic test for carbon dioxide gas:
Carbon dioxide ( $C O_{2}$ ) when passed through lime water ( $C a (O H)_{2}$ ), latter turns milky due to formation of insoluble calcium carbonate ( $C a C O_{3}$ ).The equation for this reaction can be written as:
$C O_{2} + C a (O H)_{2} \to C a C O_{3} + H_{2} O$

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