A white ppt obtained in the analysis of a mixture becomes black on treatment with `NH_(3)` or `NH_(4)OH` due to the formation of

A white ppt obtained in the analysis of a mixture becomes black on treatment with `NH_(3)` or `NH_(4)OH` due to the formation of finely divided Hg and Hg `(NH_(2))CI` i.e. `[Hg+Hg (NH_(2))CI]` The salt may be
A. `PbCI_(2)`
B. `AgCI`
C. `Hg_(2)CI_(2)`
D. `Hg_(2)CI_(2)`

A white ppt obtained in the analysis of a mixture becomes black on treatment with `NH_(3)` or `NH_(4)OH` due to the formation of finely divided Hg and

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