Cations are classified into varius groupon the basis oftheir behaviour againstsomereagents .The groupreagentused for the classifactionof most common cationare HCI,H_(2)S,NH_(4)OH,(NH_(4))_(2)CO_(3) Classification is based on whether a cationreacts withthese reagents by theformationof precipitates ornot . An aqueous solutioncontain Hg^(2+),Hg_(2)^(2+),Pb^(2+).THe addition of 2M HCI will procipitate.

Cations are classified into varius groupon the basis oftheir behaviour

1.	Cations are classified into varius groupon the basis oftheir behaviour againstsomereagents .The groupreagentused for the classifactionof most common cationare HCI,H_(2)S,NH_(4)OH,(NH_(4))_(2)CO_(3) Classification is based on whether a cationreacts withthese reagents by theformationof precipitates ornot . An aqueous solutioncontain Hg^(2+),Hg_(2)^(2+),Pb^(2+).THe addition of 2M HCI will procipitate.
Answer» `HgCI_(2)`only `PbCI_(2)"only"^(-)` `PbCI_(2)` and `Hg_(3)CI_(2)` `PbCI_(2)` and `CdCI_(2)` Solution :`2M MCI` is group reagent for reagentfor group 1 cation `PbCI_(2)` And `HgCI_(2)` will get precipitated, is their SOLUBILITY products `(K_(sp))` are less than thatof other RADICAL