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Q)

Mark the compound which turns black with $NH_4OH$

(a) Lead chloride
(b) Mercurous chloride
(c) Mercuric chloride
(d) Silver chloride

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Answer: Mercurous Chloride
 
$Hg_2Cl_2 + 2NH_4OH \longrightarrow [NH_2-Hg-Hg-Cl]$ (unstable compound) $+ NH_4Cl + H_2O$
The unstable compound when stabilises produces :-
$NH_2-HgCl \downarrow$ (White ppt.) $+ Hg \downarrow $ (Black ppt.)
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