An ammoniacal metal salt solution gives a brilliant red precipitate on addition of dimethylglyoxime The metal ion is:
- $Co ^{2+}$
- $Fe ^{2+}$
- $Ni ^{2+}$
- $Cu ^{2+}$
The Correct Option is C
Solution and Explanation
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 \( \text{Ni}^{2+} \).
Top Questions on coordination compounds
- The number of paramagnetic complexes among $[FeF_6]^{3-}, [Fe(CN)_6]^{3-}, [Mn(CN)_6]^{3-}, [Co(C_2O_4)_3]^{3-}, [MnCl_6]^{3-}$ and $[CoF_6]^{3-}$, which involved $d^2sp^3$ hybridization is ...............
- JEE Main - 2025
- Chemistry
- coordination compounds
- An octahedral complex having molecular composition Co.5NH$_3$.Cl.SO$_4$ has two isomers A and B. The solution of A gives a white precipitate with AgNO$_3$ solution and the solution of B gives a white precipitate with BaCl$_2$ solution. The type of isomerism exhibited by the complex is,
- JEE Main - 2025
- Chemistry
- coordination compounds
- The metal ion whose electronic configuration is not affected by the nature of the ligand and which gives a violet color in non-luminous flame under hot condition in borax bead test is:
- JEE Main - 2025
- Chemistry
- coordination compounds
The structure of the major product formed in the following reaction is:
- JEE Main - 2025
- Chemistry
- coordination compounds
- The coordination number of the central metal ion in \([ \text{Fe(CN)}_6 ]^{4-}\) is:
- CUET (UG) - 2025
- Chemistry
- coordination compounds
Questions Asked in JEE Main exam
The term independent of $ x $ in the expansion of $$ \left( \frac{x + 1}{x^{3/2} + 1 - \sqrt{x}} \cdot \frac{x + 1}{x - \sqrt{x}} \right)^{10} $$ for $ x>1 $ is:
- JEE Main - 2025
- Binomial theorem
- The value of current \( I \) in the electrical circuit as given below, when the potential at \( A \) is equal to the potential at \( B \), will be ________________________ A.
- JEE Main - 2025
- Electrical Circuits
Two cells of emf 1V and 2V and internal resistance 2 \( \Omega \) and 1 \( \Omega \), respectively, are connected in series with an external resistance of 6 \( \Omega \). The total current in the circuit is \( I_1 \). Now the same two cells in parallel configuration are connected to the same external resistance. In this case, the total current drawn is \( I_2 \). The value of \( \left( \frac{I_1}{I_2} \right) \) is \( \frac{x}{3} \). The value of x is 1cm.
- JEE Main - 2025
- Current electricity
If $ \theta \in [-2\pi,\ 2\pi] $, then the number of solutions of $$ 2\sqrt{2} \cos^2\theta + (2 - \sqrt{6}) \cos\theta - \sqrt{3} = 0 $$ is:
- JEE Main - 2025
- Trigonometric Equations
- If \( \int \left( x \sin^{-1} x + \sin^{-1} x (1 - x^2)^{3/2} + \frac{x}{1 - x^2} \right) dx = g(x) + C \), where C is the constant of integration, then \( g\left(\frac{1}{2}\right) \) equals:
- JEE Main - 2025
- Integration by Parts
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.