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Mercurous chloride turns black on treatment with ammonium hydroxide. This is due to the formation of
A. `Hg(NH_(2))Cl`
B. `Hg_(2)Cl_(2).NH_(4)OH`
C. Hg and `HgNH_(2)Cl`
D. `HgCl_(2).NH_(4)OH`

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`underset("mercurous chloride")(Hg_(2)Cl_(2)+2NH_(4)OH)rarr underset("black")overset(Hg+Hg(NH_(2))Cl)(rarr)+NH_(4)Cl+2H_(2)O`

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