In basic medium the amount of $Ni^{2+}$ in a solution can be estimated with the dimethylglyoxime reagent. The correct statement(s) about the reaction and the product is(are)
In ammoniacal solution $Ni^{2+}$ salts give cherry-red precipitate of nickel (II) dimethylglyoximate
Two dimethylglyoximate units are bound to one $Ni^{2+}$
In the complex two dimethylglyoximate units are hydrogen bonded to each other
Each dimethylglyoximate unit forms a six-membered chelate ring with $Ni^{2+}$
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The Correct Option isD
Solution and Explanation
Estimation of $Ni ^{2+}$ is carried out as. Filtrate of group $III + NH _{4} OH + NH _{4} Cl \stackrel{\Delta}{\longrightarrow}$ passing $H _{2} S$ gas $\rightarrow$ black ppt of NiS. This black ppt of NiS is soluble in conc. $HCl$ in presence of oxidising agent like $KClO _{3}$ $NiS +\underset{ Conc }{2 HCl }+ O \longrightarrow NiCl _{2}+ H _{2} \cdot O + S$ Now this $NiCl _{2}$, in basic medium, treated with dimethyl glyoxime, cherry red ppt of nickel (II) dimethyl glyoximate is obtained, in which two dimethyl glyoximate units are hydrogen bonded to each other and each unit forms a six-membered chelate ring with $Ni ^{2+}$.
Amine is a type of compound which is derived from ammonia (NH3). According to Organic chemistry, they are basically classified as the functional groups of the organic nitrogen compounds that contain nitrogen atoms with a lone pair.
Amine - Types
Primary Amines:
It is formed when one hydrogen atom in ammonia is substituted by an alkyl or aromatic group. Amino acids and methyl amine are the best examples that why aromatic amines include aniline.
Secondary Amines:
Amines that have two organic substitutes either alkyl or aryl ones or both and are bound to the nitrogen together with one hydrogen are termed as secondary amines. For Example, Dimethylamine.
Tertiary Amines:
Tertiary Amines are the amines where the nitrogen consists of three organic substitutes. For example, Trimethylamine and EDTA.
