During the qualitative analysis of a salt with cation $y^{2+}$,the addition of a reagent $(X)$ to an alkaline solution of the salt gives a bright red precipitate. The reagent $(X)$ and the cation $(y^{2+})$ present are respectively .... .
- ADimethylglyoxime and $Ni^{2+}$
- BDimethylglyoxime and $Co^{2+}$
- CNessler's reagent and $Hg^{2+}$
- DNessler's reagent and $Ni^{2+}$
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