The lattice of `CaF_(2)` is called fluorite structure. `SrCl_(2)` has fluorite structure. Which of the following statements is true for `SrCl_(2)` ?

Options

A. `Sr^(2+)` are at the corner and face centres of the cubic arrangment
B. `Sr^(2+)` are arranged in bcc lattice
C. `a^(-)` are arranged in fcc lattice
D. `Cl^(-)` occupy octahedral holes in the lattice

Explanation

To determine which statement is true for the structure of \( \text{SrCl}_2 \) (which has a fluorite structure similar to \( \text{CaF}_2 \)), we can analyze the arrangement of ions in the lattice.

### Step-by-Step Solution:

1. **Understanding the Fluorite Structure**:
- The fluorite structure is characterized by a face-centered cubic (FCC) arrangement of cations with anions occupying the tetrahedral holes. In the case of \( \text{CaF}_2 \), calcium ions (\( \text{Ca}^{2+} \)) are at the corners and face centers of the cubic unit cell, while fluoride ions (\( \text{F}^- \)) occupy the tetrahedral sites.

2. **Identifying the Ions in \( \text{SrCl}_2 \)**:
- In \( \text{SrCl}_2 \), strontium ions (\( \text{Sr}^{2+} \)) play a similar role to calcium ions in \( \text{CaF}_2 \), while chloride ions (\( \text{Cl}^- \)) will occupy the tetrahedral holes in the FCC lattice formed by the strontium ions.

3. **Analyzing the Statements**:
- **Statement 1**: \( \text{Sr}^{2+} \) ions are at the corners and face centers of the cubic arrangement.
- This statement is **true** because in the fluorite structure, the cations are indeed located at these positions.

- **Statement 2**: \( \text{Sr}^{2+} \) ions are arranged in a BCC lattice.
- This statement is **false**. The cations are arranged in an FCC lattice.

- **Statement 3**: \( \text{Cl}^- \) ions are arranged in an FCC lattice.
- This statement is **false**. The \( \text{Cl}^- \) ions occupy the tetrahedral holes in the FCC lattice formed by \( \text{Sr}^{2+} \) ions, not in an FCC lattice themselves.

- **Statement 4**: \( \text{Cl}^- \) ions occupy octahedral holes in the lattice.
- This statement is **false**. In the fluorite structure, \( \text{Cl}^- \) ions occupy tetrahedral holes, not octahedral holes.

4. **Conclusion**:
- The only true statement regarding the structure of \( \text{SrCl}_2 \) is **Statement 1**: \( \text{Sr}^{2+} \) ions are at the corners and face centers of the cubic arrangement.

### Final Answer:
The true statement for \( \text{SrCl}_2 \) is that \( \text{Sr}^{2+} \) ions are at the corners and face centers of the cubic arrangement.