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Nickel ions are frequently detected by the formation of red precipitate of the complex of nickel dimethylglyoxime, when heated with dimethylglyoxime.

1. CH3-C=NOH + Ni2+ ->
2. CH3-C=NOH
3. Dimethylglyoxime
4. CH3-C=NOH

Correct answer: Dimethylglyoxime

Solution

The red precipitate forms due to the reaction of nickel ions with dimethylglyoxime, which acts as a ligand to form a stable complex with Ni2+.

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