JEE Main 2022 — Practical Chemistry Question with Solution

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

 ${\mathrm{Ni}}^{2+}+\mathrm{dmg}\stackrel{\mathrm{Ammonical} \mathrm{Solution}}{\to }\underset{\mathrm{Red} \mathrm{colur}}{\left[\mathrm{Ni}{\left(\mathrm{dmg}\right)}_2\right]}\downarrow$,