1.

A solution of a metal ionwhen tretedwith KI gives a redprecipitatewhichdissolves in excess KI to give a colourless solution Moreever the solutionof metal ion ontreatmentwith a solution of cobalt (II) thoiocyamategivesriseto a deep blue crystallineprecipitate.THe metal ionis

Answer»

`Pb^(2+)`
`HG^(2+)`
`CU^(2+)`
`Co^(2+)`

Solution :`Hg^(2+) + 2I^(Theta) RARR HgI_(2) darr `(Scarlet redprecipitate )
`HgI_(2) + 2I^(theta) rarr [HgI_(4)]^(2+)`
`Hg^(2+) + Co(SCN)_(2) rarr underset("DEEP blue crystalaline")(Hg(SCN)_(2)) + Co^(2+)`


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