1.

A solution of metal ion when treated with Kl 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+)+"KL"toHgL_(2)("Red ppt.")`
`Hgl_(2)+underset(EXCESS)(Kl)tounderset("Soluble")(K_(2)Hgl_(4))`
`Hgl^(2+)+Co(SCN)_(2)tounderset("blue CRYSTALLINE precipiates")(Hg(SCN)_(2))`
Hence,(B) is the correct answer.


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