Question:
An ammoniacal metal salt solution gives a brilliant red precipitate on addition of dimethylglyoxime The metal ion is:
An ammoniacal metal salt solution gives a brilliant red precipitate on addition of dimethylglyoxime The metal ion is:
Updated On: Mar 19, 2025
- $Co ^{2+}$
- $Fe ^{2+}$
- $Ni ^{2+}$
- $Cu ^{2+}$
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The Correct Option is C
Solution and Explanation
Dimethylglyoxime (\( \text{DMG} \)) reacts with \( \text{Ni}^{2+} \) ions in the presence of ammonium hydroxide (\( \text{NH}_3 \)) to form a bright red precipitate of nickel dimethylglyoxime complex \([ \text{Ni(DMG)}_2 ]\).
The reaction is as follows: \[ \text{Ni}^{2+} + 2 \text{DMG} + \text{NH}_3 \longrightarrow [ \text{Ni(DMG)}_2 ] \, \text{(red complex)} \]
Observation: The formation of a rosy red precipitate confirms the presence of \( \text{Ni}^{2+} \).
The reaction is as follows: \[ \text{Ni}^{2+} + 2 \text{DMG} + \text{NH}_3 \longrightarrow [ \text{Ni(DMG)}_2 ] \, \text{(red complex)} \]
Observation: The formation of a rosy red precipitate confirms the presence of \( \text{Ni}^{2+} \).
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Concepts Used:
Coordination Compounds
A coordination compound holds a central metal atom or ion surrounded by various oppositely charged ions or neutral molecules. These molecules or ions are re-bonded to the metal atom or ion by a coordinate bond.
Coordination entity:
A coordination entity composes of a central metal atom or ion bonded to a fixed number of ions or molecules.
Ligands:
A molecule, ion, or group which is bonded to the metal atom or ion in a complex or coordination compound by a coordinate bond is commonly called a ligand. It may be either neutral, positively, or negatively charged.