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 from the reaction of DMG (Dimethylglyoxime) with Ni(II) salt and NH₄OH, we need to analyze the properties of the resulting complex. The question asks us to identify which of the provided statements about the red precipitate is incorrect.

### Step-by-Step Solution:

1. **Understanding the Reaction**:
- When DMG is added to a Ni(II) salt in the presence of NH₄OH, a red precipitate is formed. This indicates the formation of a nickel-dimethylglyoxime complex.

2. **Analyzing the Complex**:
- The nickel ion (Ni²⁺) has an electronic configuration of [Ar] 3d⁸. In the presence of ligands like DMG, it can form a complex.

3. **Hybridization**:
- The geometry of the Ni-DMG complex is typically square planar. For a square planar complex, the hybridization is usually dsp², not sp³.
- Therefore, the statement that "Ni²⁺ is sp³ hybridized" is incorrect.

4. **Ionic vs Non-Ionic Complex**:
- The Ni-DMG complex is a non-ionic complex. This statement is correct.

5. **Hydrogen Bonding**:
- The presence of intramolecular hydrogen bonding in the complex can be observed. This statement is also correct.

6. **Magnetism**:
- The Ni-DMG complex is diamagnetic because it has no unpaired electrons. This statement is correct.

7. **Conclusion**:
- The only incorrect statement about the red precipitate is that "Ni²⁺ is sp³ hybridized." The correct hybridization for this complex is dsp².

### Final Answer:
The wrong statement about the red precipitate is: "Ni²⁺ is sp³ hybridized."