1.

A solution of a metal ion when treated with KI gives a red precipitate which dissolves in excess KI to give a colourless solution.Moreover, the solution of metal ion on treatment with a solution of cobalt (II) thiocyanate gives rise to a deep blue crystalline precipitate.The metal ion is:

Answer»

`Pb^(2+)`
`Hg^(2+)`
`Cu^(2+)`
`Co^(2+)`

SOLUTION :`Hg^(2+)+2I^(-)to HgI_(2)DARR` (scarlet/red)
`HgI_(2)+2I^(-)("excess")to[HgI_(4)]^(2-)`(soluble complex)
`Hg^(2+) +Co(SCN)_(2) to Co[Hg(SCN)_(4)]darr` (DEEP blue)


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