Three separate samples of a solution of a single salt gave these results. One formed a white precipitate…

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. $\mathrm{NaCl}$ solution and one formed a black precipitate with $\mathrm{H}_{2} \mathrm{~S}$. The salt could be
  1. $\mathrm{AgNO}_{3}$
  2. $\mathrm{Pb}\left(\mathrm{NO}_{3}ight)_{2}$
  3. $\mathrm{Hg}\left(\mathrm{NO}_{3}ight)_{2}$
  4. $\mathrm{MnSO}_{4}$

Solution

$\mathrm{Pb}\left(\mathrm{NO}_{3}ight)_{2}+2 \mathrm{NH}_{4} \mathrm{OH} ightarrow$
$\mathrm{Pb}(\mathrm{OH})_{2} \downarrow+2 \mathrm{NH}_{4} \mathrm{NO}_{3}$
(white ppt) $\mathrm{Pb}\left(\mathrm{NO}_{3}ight)_{2}+2 \mathrm{HCl} ightarrow \mathrm{PbCl}_{2} \downarrow+2 \mathrm{HNO}_{3}$
(white ppt) $\mathrm{Pb}\left(\mathrm{NO}_{3}ight)_{2}+\mathrm{H}_{2} \mathrm{~S} ightarrow \mathrm{PbS} \downarrow+2 \mathrm{HNO}_{3}$
(black) ^

Asked in: JEE-TOPICTESTS-CHEMISTRY

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