Lime water turns milky when _______ gas is passed through it.

H_{2}

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C O

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C O_{2}

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S O_{2}

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Solution

The correct option is C $C O_{2}$
Lime water is $C a (O H)_{2}$ . When $C O_{2}$ gas is passed through it, it turns milky due to the formation of $C a C O_{3}$ . The reaction is : $C a (O H)_{2} + C O_{2} \to C a C O_{3} + H_{2} O$

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