1.

Why are only Pb^(2+),Ag^(o+) and Hg_(2)^(2+) ions precipitated in group I?

Answer»

Solution :Out of all the chlorides those of `PB^(2+), Ag^(o+)` and `Hg_(2)^(2+)` are insoluble HCl is the reagent group I. thus chlorides of `Pb^(2+),Ag^(o+)` and `Hg_(2)^(2+)` are precipitated I group I.
`AgNO_(3)+Hcltounderset(("white ppt."))(AgCl(s))+HNO_(3)`
Other cations remain in solution because their chlorides are SOLUBLE.


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