Analytical ChemistryMedium
Question
A solution of 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
Options
A.Pb2+
B.Hg2+
C.Cu2+
D.Co2+
Solution
Hg2+ + KI → HgI2(Red ppt.)
HgI2 + KI → K2HgI4
(excess) Solule
HgI2 + Co(SCN)2 → Hg(SCN)2
blue crystalline precipiates
HgI2 + KI → K2HgI4
(excess) Solule
HgI2 + Co(SCN)2 → Hg(SCN)2
blue crystalline precipiates
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