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During the qualitative analysis of salt with cation \( \left(\mathrm{Y}^{2+}\right) \), addition of a reagent \( (\mathrm{X}) \) to alkaline solution of the salt gives a bright red precipitate. The reagent \( (\mathrm{X}) \) and the cation \( \left(\mathrm{Y}^{2+}\right) \) present respectively are:
(a) Dimethylglyoxime and \( \mathrm{Ni}^{2+} \)
(b) Dimethylglyoxime and \( \mathrm{Co}^{2+} \)
(c) Nesslers reagent and \( \mathrm{Hg}^{2+} \)
(d) Nesslers reagent and \( \mathrm{Ni}^{2+} \)
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