Cations are classified into varius group on the basis of their behaviour against some reagents .The group reagent used for the classifaction of most common cation are `HCI,H_(2)S,NH_(4)OH,(NH_(4))_(2)CO_(3)` Classification is based on whether a cation reacts with these reagents by the formation of precipitates or not .
An aqueous solution contain `Hg^(2+),Hg_(2)^(2+),Pb^(2+)`.THe addition of `2M HCI` will procipitate.

Options

A. `HgCI_(2)`only
B. `PbCI_(2)"only"^(-)`
C. `PbCI_(2)` and `Hg_(3)CI_(2)`
D. `PbCI_(2)` and `CdCI_(2)`

Answer

c

Explanation

`2M MCI` is group reagent for reagent for group 1 cation `PbCI_(2)` And `HgCI_(2)` will get precipitated, is their solubility products `(K_(sp))` are less than that of other radical