| A solution of a metal ion when treated with KI gives a red precipitate which dissolves in excess of KI to give a colourless solution. |
| Moreover, the solution of metal ion on treatment with a solution of cobalt (II) thiocyanate gives rise to deep blue crystalline precipitate. The metal ion is |
A) \[P{{b}^{2+}}\]
B) \[H{{g}^{2+}}\]
C) \[C{{u}^{2+}}\]
D) \[C{{o}^{2+}}\]
Correct Answer: B
Solution :
[b]:\[H{{g}^{2+}}+2KI\xrightarrow[{}]{{}}\underset{(scarlet\,red)}{\mathop{Hg{{I}_{2}}\downarrow +2{{K}^{+}}}}\,\] \[Hg{{I}_{2}}+2KI\xrightarrow[{}]{{}}\underset{(Nessler's\,reagent)}{\mathop{{{K}_{2}}Hg{{I}_{4}}}}\,\] \[H{{g}^{2+}}+C{{o}^{2+}}+4SC{{N}^{-}}\xrightarrow[{}]{{}}\underset{(deep\,blue\,crystalline)}{\mathop{Co[Hg{{(SCN)}_{4}}]\downarrow }}\,\]
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