Reagent used to test ${N i}^{2 +}$ ion is dimethyl glyoxime.

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Solution

Reagent used to test ${N i}^{2 +}$ ion is dimethyl glyoxime.
Ni compounds react with dimethyl glyoxime in ammoniacal solution to form red precipitate of nickel dimethylglyoxime.
$2 D M G + N i C l_{2} + 2 N H_{4} O H \to N i D M G_{2} ↓ (r e d p p t) + 2 N H_{4} C l + 2 H_{2} O$

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