An ammoniacal metal salt solution gives a brilliant red precipitate on addition of dimethylglyoxime. The metal ion is: [2023]

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Solution

Q.
An ammoniacal metal salt solution gives a brilliant red precipitate on addition of dimethylglyoxime. The metal ion is: [2023]

1 ${Co}^{2 +}$

2 ${Fe}^{2 +}$

3 ${Ni}^{2 +}$

4 ${Cu}^{2 +}$

Ans.
(3)

${Ni}^{+ 2} + dmg + {NH}_{4} OH \to \underset{red ppt}{[Ni {(dmg)}_{2}] ↓} + {NH}_{4}^{+} + H_{2} O$

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