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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 a. Pb^2+ b. Hg^2+ c. Cu^2+ d. Co^2+

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
a. Pb^2+
b. Hg^2+
c. Cu^2+
d. Co^2+

Grade:11

1 Answers

Navjyot Kalra
askIITians Faculty 654 Points
9 years ago

12. (b) Hg2+ + 2KI ? HgI2 ?+2K+

(red ppt)

HgI2 + 2KI ? K2 [HgI4]

Hg2+ + Co2+ + 4SCN- ? Co[Hg(SCN)4]?

(deep blue crystalline)

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