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. Morever, 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+) (aq) + 2KI (aq) to underset("(Scarlet RED)")(HgI_2 (s)) + 2K^(+) (aq)`
`HgI_2(s) + 2KI (aq) to K_2[HgI_4](aq)`
`Co^(2+)(aq) + Hg^(2+) (aq) + 4SCN^(-) (aq) to underset("DEEP blue ")(Co[Hg(SCN)_4])(s)`


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