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A white crystalline substance dissolves in water. On passing $H_{2} S$ gas in this solution, a black ppt is obtained. The black ppt dissolves completely in hot $H N O_{3}$ . On adding a few drops of conc. $H_{2} S O_{4}$ , a white ppt is obtained. This ppt is that of

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$P b S O_{4}$

$B a S O_{4}$

$C d S O_{4}$

$S r S O_{4}$

answer is C.

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