Three separate samples of a solution of a single salt gave these...

Three separate samples of a solution of a single salt gave these results. One formed a white precipitate with excess ammonia solution, one formed a white precipitate with dil. HCl solution and one formed a black precipitate with

\mathrm{H}_{2} \mathrm{ S}

. The salt could be

Options

A $\mathrm{AgNO}_{3}$
B\mathrm{Pb} $\left(\mathrm{NO}_{3}\right)_{2}$
C\mathrm{Hg} $\left(\mathrm{NO}_{3}\right)_{2}$
D $\mathrm{MnSO}_{4}$

Correct answer

B. \mathrm{Pb} $\left(\mathrm{NO}_{3}\right)_{2}$

Step-by-step solution

\mathrm{Pb}\left(\mathrm{NO}_{3}\right)_{2}+2 \mathrm{NH}_{4} \mathrm{OH}

\begin{array}{r} \rightarrow \mathrm{Pb}(\mathrm{OH})_{2} \downarrow+2 \mathrm{NH}_{4} \mathrm{NO}_{3}(\text{ white ppt })\\ \mathrm{Pb}\left(\mathrm{NO}_{3}\right)_{2}+2 \mathrm{HCl} \rightarrow \mathrm{PbCl}_{2} \downarrow+2 \mathrm{HNO}_{3}(\text{ whiteppt })\\ \mathrm{Pb}\left(\mathrm{NO}_{3}\right)_{2}+\mathrm{H}_{2} \mathrm{ S} \rightarrow \mathrm{PbS} \downarrow+2 \mathrm{HNO}_{3} \text{ (black) } \end{array}

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