A gas $' X'$ turns lime water milky. The milkiness disappears if excess of $' X'$ is passed. Milkiness appears on heating the colourless solution. Then $' X'$ is

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$C O_{2} (o r) S O_{2}$

$N O_{2}$

$H_{2} S$

$N H_{3}$

answer is B.

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Detailed Solution

$Lime water \to_{}^{C O_{2}} C a C O_{3} \to_{}^{excess C O_{2}} Soluble C a {(H C O_{3})}_{2} Lime water \to_{}^{S O_{2}} C a S O_{3} \to_{}^{excess S O_{2}} Soluble C a {(H S O_{3})}_{2}$

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