WBJEE · Chemistry · Coordination Compounds
In basic medium the amount of \(\mathrm{Ni}^{2+}\) in a solution can be estimated with the dimethylglyoxime reagent. The correct statement(s) about the reaction and the product is (are)
- A in a ammoniacal solution \(\mathrm{Ni}^{2+}\) salts give cherry-red precipitate of nickel(il) dimethylglyoximate
- B two dimethylglyoximate units are bound to one \(\mathrm{Ni}^{2 *}\)
- C in the complex two dimethylglyoximate units are hydrogen bonded to each other
- D each dimethylglyoximate unit forms a six membered chelate ring with \(\mathrm{Ni}^{2+}\)
Answer & Solution
Correct Answer
(D) each dimethylglyoximate unit forms a six membered chelate ring with \(\mathrm{Ni}^{2+}\)
Step-by-step Solution
Detailed explanation
Estimation of \(\mathrm{Ni}^{2+}\) is carried out as. Filtrate of group III \(+\mathrm{NH}_{4} \mathrm{OH}+\mathrm{NH}_{4} \mathrm{Cl} \longrightarrow\) passing \(\mathrm{H}_{2} \mathrm{S}\) gas \(\rightarrow\) black pPt of NiS. This black ppt of NiS is soluble in conc. HCl in…
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