To a solution of a substance, gradual addition of ammonium hydroxid...

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To a solution of a substance, gradual addition of ammonium hydroxide results in a black precipitate which does not dissolve in excess of \( \mathrm{NH}_{4} \mathrm{OH} \). However,
\( \mathrm{P} \) when \( \mathrm{HCl} \) is added to the original solution, a white

W precipitate is formed. The solution contained:
(a) Lead salt
(b) Silver salt
(c) Mercurous salt
(d) Copper salt
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