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 brownish black
P precipitate which does not dissolve in excess of \( \mathrm{NH}_{4} \mathrm{OH} \).

W However, when \( \mathrm{KI} \) (not in excess) is added to the original solution, a green precipitate is formed. The solution contained :
(a) Lead salt
(b) Silver salt
(c) Mercurous salt
(d) Copper salt.
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