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 so

Question

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 so

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+)`

Monjur Alahi

11 views

2025-01-04 04:42

1 Answers

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Salim Ahmed Kawsar · Accepted Answer · 2023-02-05T15:29:48+06:00

Salim Ahmed Kawsar

Correct Answer - B
`Hg^(2+)+2I^(-)to HgI_(2)darr` (scarlet/red)
`HgI_(2)+2I^(-)("excess")to[HgI_(4)]^(2-)`(soluble complex)
`Hg^(2+) +Co(SCN)_(2) to Co[Hg(SCN)_(4)]darr` (deep blue)

11 views Answered 2023-02-05 15:29