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  4. A gas obtained by addition of dil.H2SO4 to an unknown mixture, which turns lead acetate paper black. The unknown mixture contains:

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Q. A gas obtained by addition of $dil.H_{2}SO_{4}$ to an unknown mixture, which turns lead acetate paper black. The unknown mixture contains:

NTA AbhyasNTA Abhyas 2022

Solution:

It must be sulphide as
$\left( CH _{3} COO \right)_{2} Pb + H _{2} S ( g ) \rightarrow 2 CH 3 COOH + PbS ($ Black ppt $)$