A gas is obtained by addition of dil. $H_{2} S O_{4}$ to a mixture which turns lead acetate paper black. It is:

S O_{2}

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C O_{2}

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H_{2} S

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N O_{2}

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Solution

The correct option is B $H_{2} S$
When $F e S$ is treated with dil. $H_{2} S O_{4}$ then $H_{2} S$ gas is produced , which turns lead acetate paper black.
$F e S + H_{2} S O_{4} \to H_{2} S + F e S O_{4}$
$H_{2} S + (C H_{3} C O O)_{2} P b \to P b S (b l a c k) + 2 C H_{3} C O O H$

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