A solution of a metal ion when treated with KI solution gives a red precipitate which dissolves in excess of KI solution to give a colourless solution. Moreover, the solution of the same metal ion on treatment with the solution of cobalt (II) thiocyanate gives rise to a deep blue crystalline precipitate. The metal ion isA. `Pb^(2+)`B. `Hg^(2+)`C. `Cu^(2+)`D. `Co^(2+)`

A solution of a metal ion when treated with KI solution gives a red pr

1.	A solution of a metal ion when treated with KI solution gives a red precipitate which dissolves in excess of KI solution to give a colourless solution. Moreover, the solution of the same metal ion on treatment with the solution of cobalt (II) thiocyanate gives rise to a deep blue crystalline precipitate. The metal ion isA. `Pb^(2+)`B. `Hg^(2+)`C. `Cu^(2+)`D. `Co^(2+)`
Answer» Correct Answer - B It is the correct answer : `{:("Hg"^(2+),+,2l^(-),rarr,Hgl_(2),),(,,(Kl),,("Scarlet red ppt"),),(Hgl_(2),+,2Kl,rarr,underset(("Colourless"))(K_(2)Hgl_(4)),),("Hg"^(2+),+,Co(SCN)_(2),rarr,underset(("Deep blue crystalline ppt."))(Co [Hg (SCN)_(2)]),):}`

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