During the qualitative analysis of salt with cation y ^ 2 + ,...

During the qualitative analysis of salt with cation ${Ni}^{2 +}$, addition of a reagent $Dimethylglyoxime$ to alkaline solution of the salt gives a bright red precipitate according to the following reaction. So, The reagent $\left(X\right)$ and the cation $\left({y}^{2 +}\right)$ respectively are Dimethylglyoxime and ${Ni}^{2 +}$

${Ni}^{2 +} + dmg\overset{AmmonicalSolution}{\to}\mathop{\left[Ni{\left(dmg\right)}_{2}\right]}_{Redcolur} ↓$,