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 aqucous solution which is sightly acids contains cattions Fe^(2+),Zn^(2+) and Cu^(2+). THe rengent added in excess to this solutionwould identify the separate Fe^(2+) ion in one step is

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 aqucous solution which is sightly acids contains cattions Fe^(2+),Zn^(2+) and Cu^(2+). THe rengent added in excess to this solutionwould identify the separate Fe^(2+) ion in one step is
Answer» `2M HCI` `6M NH_(3)` `6M NaOH` `H_(2)S gas ` Solution :`Fe^(3+) + 3NH_(4)OH rarr Fe(OH)_(3) darr ("reddish brown") +3NH_(4)^(o+)` `Cu^(2+) + 4NH_(3) rarr underset(("blue COLOUR soluble complex"))([Cu(NH_(3))_(4)]^(2+))` ` Zn^(2+) + 4NH_(3) rarr underset(("colourless soluble complex"))([Zn(NH_(3))_(4)]^(2+))`