Bright red precipitate with dimethylglyoxime: the reagent and the cation (Ni2+)

1. A.
   Dimethylglyoxime and ${Ni}^{2 +}$
2. B.
   Dimethylglyoxime and ${Co}^{2 +}$
3. C.
   Nessler's reagent and ${Hg}^{2 +}$
4. D.
   Nessler's reagent and ${Ni}^{2 +}$

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1. A.
   ${Co}^{2 +}$
2. B.
   ${Ni}^{2 +}$
3. C.
   ${Fe}^{2 +}$
4. D.
   ${Cu}^{2 +}$

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1. A.
   sodium nitroprusside
2. B.
   neutral ${FeCl}_{3}$
3. C.
   meta-dinitrobenzene
4. D.
   dimethyl glyoxime

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