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+)+2KItoHgI_(2)darr+underset("red PPT")(2K^(+))`
`HgI_(2)+2KItoK_(2)HgI_(4)`
`Hg^(2+)+Co^(2+)+underset("deep BLUE crystalline")(4SCN^(-)toCoHg(SCN)_(4)darr"")`


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