An aqueous solution of an unknown salt is made slightly alkaline by adding ammonium hydroxide. Upon the addition of an alcoholic solution of dimethylglyoxime, a brilliant red precipitate is obtained. The cation present in the unknown salt i

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An aqueous solution of an unknown salt is made slightly alkaline by adding ammonium hydroxide. Upon the addition of an alcoholic solution of dimethylglyoxime, a brilliant red precipitate is obtained. The cation present in the unknown salt is:

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Correct answer: C. Ni ²⁺

The addition of dimethylglyoxime (DMG) in an ammoniacal medium is a specific test for the Ni ²⁺ ion in qualitative analysis. When DMG is added to a slightly basic solution containing Ni ²⁺ ions, it forms a brilliant rosy red precipitate of bis(dimethylglyoximato)nickel(II). Ni ²⁺ + 2 DMG NH ₄ OH [ Ni ( DMG )₂] (red precipitate) Hence, the cation present is Ni ²⁺ . Answer: Ni ²⁺

An aqueous solution of an unknown salt is made slightly alkaline by adding ammonium hydroxide. Upon the addition of an alcoholic solution of dimethylglyoxime, a brilliant red precipitate is obtained. The cation present in the unknown salt is:

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