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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)
    Pb2+
  • b)
    Hg2+
  • c)
    Cu2+
  • d)
    Co2+
Correct answer is option 'B'. Can you explain this answer?
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A solution of a metal ion when treated with KI gives a red precipitate...


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


Explanation:

Metal ions can be identified based on the colors of the precipitates formed when they react with specific reagents. In this case, the metal ion is identified as Hg2+ based on the reactions described.

Reaction with KI:
- When the metal ion solution is treated with KI, a red precipitate is formed. This red precipitate is mercuric iodide (HgI2), which is insoluble in water.
- However, when excess KI is added to the red precipitate, it dissolves to give a colorless solution. This is a characteristic reaction of mercuric ions.

Reaction with Cobalt (II) Thiocyanate:
- When the metal ion solution is treated with a solution of cobalt (II) thiocyanate, a deep blue crystalline precipitate is formed. This blue precipitate is formed due to the formation of a complex between mercury ions and thiocyanate ions.

Based on these reactions, the metal ion is identified as Hg2+, which is mercury(II) ion. Therefore, the correct answer is option B. Mercury(II) ions exhibit these specific reactions with KI and cobalt (II) thiocyanate, allowing for their identification in qualitative analysis.
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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 isa)Pb2+b)Hg2+c)Cu2+d)Co2+Correct answer is option 'B'. Can you explain this answer?
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