During the qualitative analysis of salt with cation y2+, addition of a reagent (X) to alkaline solution of the salt gives a bright red precipitate. The reagent (X) and the cation (y2+) present respectively are :
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- Dimethylglyoxime and \(\mathrm{Ni^{2+}}\)
- Dimethylglyoxime and \(\mathrm{Co^{2+}}\)
- Nessler's reagent and \(\mathrm{Hg^{2+}}\)
- Nessler's reagent and \(\mathrm{Ni^{2+}}\)
The Correct Option is A
Solution and Explanation
Nessler's reagent (\(\mathrm{K_2HgI_4}\) in KOH) gives a brown precipitate/colour with ammonium ions, not a bright red precipitate with \(\mathrm{Hg^{2+}}\) or \(\mathrm{Ni^{2+}}\). \(\mathrm{Co^{2+}}\) does not give a red precipitate with DMG.
Answer: (1) Dimethylglyoxime and \(\mathrm{Ni^{2+}}\)
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