Which one of the following statement(s) is/are false?

Options

A. weak ligands like `F^(-),Cl^(-) and and OH^(-)` usually form low spin complexes
B. Strong ligand like `CN^(-)` and `NO_(2)^(-)`, generally form high spin complexes
C. `[FeF_(6)]^(3-)` is high spin complex
D. `[Ni(CO)_(4)]` is high spin complex

Explanation

To determine which statement(s) are false regarding coordination compounds, we will analyze the statements one by one based on the information provided in the video transcript.

### Step-by-Step Solution:

1. **Understanding Ligands**:
- Ligands can be classified as weak or strong based on their ability to cause electron pairing in the d-orbitals of the metal ion.
- Weak field ligands (like F⁻, Cl⁻, OH⁻) do not cause significant pairing of electrons and typically lead to high spin complexes.
- Strong field ligands (like CN⁻, CO) cause pairing of electrons and typically lead to low spin complexes.

2. **Analyzing the Statements**:
- **Statement 1**: Weak ligands form low spin complexes.
- This statement is **false**. Weak ligands generally form high spin complexes because they do not cause electron pairing.

- **Statement 2**: Strong ligands form high spin complexes.
- This statement is **false**. Strong ligands typically form low spin complexes due to electron pairing.

- **Statement 3**: FeF₆³⁻ is a high spin complex.
- This statement is **true**. Fluoride is a weak field ligand, and thus FeF₆³⁻ does not cause pairing, resulting in a high spin configuration.

- **Statement 4**: Ni(CO)₄ is a high spin complex.
- This statement is **false**. CO is a strong field ligand and causes pairing of electrons, leading to a low spin configuration.

3. **Conclusion**:
- The false statements are:
- Statement 1: Weak ligands form low spin complexes.
- Statement 2: Strong ligands form high spin complexes.
- Statement 4: Ni(CO)₄ is a high spin complex.

### Summary of False Statements:
- Weak ligands do not form low spin complexes.
- Strong ligands do not form high spin complexes.
- Ni(CO)₄ is not a high spin complex.