To detect the presence of $C O_{2}$ ________ is used.

lime water

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salt water

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sweet water

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none of these

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Solution

The correct option is C lime water
To detect the presence of $C O_{2}$ lime water is used. Lime water is calcium hydroxide which reacts with $C O_{2}$ to form $C a C O_{3}$ .
$C a C O_{3}$ is insoluble in water so it turns solid precipitate.
$C O_{2} + C a (O H)_{2} \to C a C O_{3} + H_{2} O$
On passing excess $C O_{2}$ the milkiness disappears and forms calcium bicarbonate formed which is soluble in water.
$C O_{2} + C a C O_{3} + H_{2} O \to C a (H C O_{3})_{2}$

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