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(C) The reaction with $HCl$ indicates the presence of $Pb^{2+}$,$Ag^+$,or $Hg_2^{2+}$ as they form white chloride precipitates. When $NH_4OH$ is added

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Mercurous salt

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(C) The reaction with $HCl$ indicates the presence of $Pb^{2+}$,$Ag^+$,or $Hg_2^{2+}$ as they form white chloride precipitates. When $NH_4OH$ is added to a mercurous salt $(Hg_2^{2+})$,it undergoes disproportionation to form a black precipitate of metallic mercury $(Hg)$ and amino-mercuric chloride $(Hg(NH_2)Cl)$. The reaction is: $Hg_2^{2+} + 2NH_4OH 	o Hg(l) + Hg(NH_2)Cl(s) + NH_4^+ + 2H_2O$. This black precipitate does not dissolve in excess $NH_4OH$.

To a solution of a substance,gradual addition of ammonium hydroxide results in a black precipitate which does not dissolve in excess of $NH_4OH$. However,when $HCl$ is added to the original solution,a white precipitate is formed. The solution contained

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