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If X turns ...

Question

If $(X)$ turns lime water milky, then $X$ may be :

C O_{2}

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S O_{2}

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N O_{2}

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O_{2}

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Solution

The correct options are
A $C O_{2}$
D $S O_{2}$
Carbon dioxide passed into limewater gives a milky solution. This is due to the insoluble suspension of $C a C O_{3}$ formed:
$C a (O H)_{2} (a q) + C O_{2} (g) \to C a C O_{3} (s) + H_{2} O (l)$
If excess $C O_{2}$ is added, the following reaction takes place:
$C a C O_{3} (s) + H_{2} O (l) + C O_{2} (g) \to C a (H C O_{3})_{2} (a q)$
The milkiness disappears since calcium bicarbonate is water-soluble.
In the same way, $S O_{2}$ also turns lime water milky.
$C a (O H)_{2} (a q) + S O_{2} (g) \to C a S O_{3} (s) + H_{2} O (l)$

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