Which of the following transition metal cations yields a characteristic rosy-red (or bright red) com — Qualitative and Quantitative Analysis Chemistry Question
Question
Which of the following transition metal cations yields a characteristic rosy-red (or bright red) complex precipitate when treated with dimethylglyoxime (DMG) in an ammoniacal medium?
Answer: B
💡 Solution & Explanation
The dimethylglyoxime (DMG) test is highly specific for Nickel(II) ions in qualitative analysis. When DMG is added to an alkaline (ammoniacal) solution of $Ni^{2+}$, a brilliant rosy-red precipitate of bis(dimethylglyoximato)nickel(II) $[Ni(DMG)_2]$ is formed. This complex is stabilized by intramolecular hydrogen bonding.
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