Which of the following reagents can be used to identify Ni+2 ions in solution?
Correct answer: C. dimethylglyoxime
- A. Ethylenediamine
- B. potassium ferrocyanide
- C. dimethylglyoxime
- D. potassium permanganate
Explanation
When identifying Ni+2 ions, dimethylglyoxime is the reagent of choice. Adding dimethyl glyoxime to a solution of Ni+2 ions along with ammonium hydroxide results in the formation of a bright red precipitate. This distinctive color change indicates the presence of Ni+2 ions. The other options, such as ethylenediamine, potassium ferrocyanide, and potassium permanganate, do not react in a way that specifically identifies Ni+2 ions, making them incorrect choices.
This question appeared on the ETEA MDCAT 2006 paper, which you can sit online with every answer explained.
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