It is an experimental fact that : `DMG+Ni(II)"salt"+NH_(4)OH to` Red precipitate
Which of the following is wrong about this red precipitate ?

Options

A. It is non-ionic complex.
B. It involves intra molecular H-bonding.
C. `Ni(II) is sp^(3)` hybridised.
D. It is a diamagnetic complex.

Explanation

To solve the question regarding the red precipitate formed by the reaction of DMG (dimethylglyoxime) with Ni(II) salt in the presence of NH₄OH, we will analyze the properties of the complex formed and identify which statement about the red precipitate is incorrect.

### Step-by-Step Solution:

1. **Identify the Reaction**:
The reaction involves dimethylglyoxime (DMG) reacting with nickel(II) ions (Ni²⁺) in the presence of ammonium hydroxide (NH₄OH). This leads to the formation of a red precipitate.

2. **Determine the Complex Formed**:
The complex formed is Ni(DMG)₂, which indicates that nickel is coordinated with two dimethylglyoxime ligands.

3. **Oxidation State of Nickel**:
In the complex Ni(DMG)₂, nickel is in the +2 oxidation state. The electronic configuration of Ni²⁺ is [Ar] 3d⁸.

4. **Hybridization of the Complex**:
Since DMG is a bidentate ligand, it binds to the nickel ion at two sites. Nickel(II) with a d⁸ configuration and strong field ligand like DMG will undergo pairing of electrons. The hybridization of the complex is dsp², which is characteristic of square planar complexes.

5. **Magnetic Properties**:
Because of the pairing of electrons in the d-orbitals, the complex is diamagnetic, meaning it does not have unpaired electrons.

6. **Charge of the Complex**:
The overall charge of the complex Ni(DMG)₂ is neutral. Since both DMG ligands are neutral, the complex itself has no net charge.

7. **Evaluate the Statements**:
Now, we need to evaluate the provided statements about the red precipitate:
- Statement regarding the oxidation state and electronic configuration is correct.
- Statement about the hybridization being sp³ is incorrect because the correct hybridization is dsp².
- Statement about the complex being diamagnetic is correct.
- Statement about the complex being neutral is also correct.

8. **Conclusion**:
The statement that is wrong about the red precipitate is the one that claims nickel(II) is sp³ hybridized.

### Final Answer:
The incorrect statement about the red precipitate is that nickel(II) is sp³ hybridized.

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