Qualitative Analysis - Result Question 7

####7. 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

(2007,3M)

(a) Pb2+

(b) Hg2+

(c) Cu2+

(d) Co2+

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Solution:

  1. Hg2++2IHgI2 (red)

HgI2+2KIK2[HgI4] Soluble  Hg2++Co(SCN)2Co[Hg(SCN)4] Blue 



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