The correct statement for d-block element is

Options

A. it shows magnetic property
B. It has variable valency
C. It has tendency of formation of coloured ions.
D. it has complete d-orbitals.

Answer

To determine the correct statements regarding d-block elements, we can analyze each option based on the properties of these elements.

### Step-by-Step Solution:

1. **Understanding Magnetic Properties**:
- d-block elements are known for their magnetic properties due to the presence of unpaired electrons in their d-orbitals.
- The more unpaired electrons present, the stronger the magnetic property.
- **Conclusion**: Option A is correct.

2. **Variable Valency**:
- d-block elements exhibit variable valency because they can lose different numbers of electrons from their d-orbitals and s-orbitals.
- For example, manganese (Mn) can have oxidation states ranging from +0 to +7.
- **Conclusion**: Option B is correct.

3. **Formation of Colored Ions**:
- The presence of unpaired electrons in d-orbitals allows for d-d transitions, which can absorb specific wavelengths of light, resulting in colored compounds.
- This is why many d-block metal ions are colored.
- **Conclusion**: Option C is correct.

4. **Complete d-Orbitals**:
- d-block elements do not have completely filled d-orbitals. Instead, they often have partially filled d-orbitals.
- A completely filled d-orbital would not exhibit the properties discussed above.
- **Conclusion**: Option D is incorrect.

### Final Answer:
The correct statements for d-block elements are:
- Option A: It shows magnetic properties.
- Option B: It has variable valency.
- Option C: It has a tendency to form colored ions.