Which of the following statement`(s)` is//are correct?

Options

A. Primary valency of the central metal of a complex is always satisfied by anions .
B. Secondary valency of the central metal of a complex may be satisfied by either negative ions or neutral molecules .
C. Species which show primary valencies in a complex compound can be precipitated out .
D. None of these

Explanation

To determine which statements regarding primary and secondary valency of a central metal ion are correct, we will analyze each statement based on the concepts of coordination chemistry.

### Step-by-Step Solution:

1. **Understanding Primary Valency**:
- Primary valency refers to the ionizable part of the coordination compound. It is satisfied by anions (negatively charged ions).
- The primary valency corresponds to the oxidation state of the central metal ion.

2. **Understanding Secondary Valency**:
- Secondary valency refers to the non-ionizable part of the coordination compound. It can be satisfied by either neutral molecules or anions.
- The secondary valency corresponds to the coordination number of the central metal ion, which indicates how many ligands are bonded to it.

3. **Analyzing Statement A**:
- Statement A claims that primary valency is satisfied by anions. This is correct as per the definitions provided.

4. **Analyzing Statement B**:
- Statement B states that secondary valency can be satisfied by a neutral molecule or a negative ion (anion). This is also correct based on the definitions.

5. **Analyzing Statement C**:
- Statement C mentions that species showing primary valency in a complex compound can be precipitated out. This is true because primary valency relates to the ionizable part, which can form precipitates.

6. **Conclusion**:
- All statements A, B, and C are correct regarding the primary and secondary valency of a central metal ion.

### Final Answer:
All of the statements (A, B, and C) are correct.

---