In the crystal lattice of `CsCl,CS^(+)` ions are present at the

Options

A. tetrahedral voids of the unit cell
B. octahedral voids of the unit cell
C. body-centre of the unit cell
D. face-centre of the unit cell

Explanation

To solve the question regarding the positions of cesium ions in the crystal lattice of cesium chloride (CsCl), we can follow these steps:

### Step 1: Understand the Structure of CsCl
In the crystal lattice of cesium chloride, the arrangement of ions is crucial. CsCl has a specific type of crystal structure known as the body-centered cubic (BCC) structure.

**Hint:** Recall that CsCl consists of two types of ions: Cs⁺ and Cl⁻. Understanding their arrangement is key.

### Step 2: Identify the Radius Ratio
The radius ratio of the cation (Cs⁺) to the anion (Cl⁻) plays an important role in determining the type of lattice structure. For CsCl, the radius ratio falls between 0.734 and 1.

**Hint:** Remember that the radius ratio can help predict the coordination number and the type of lattice structure.

### Step 3: Determine the Positions of Ions
In the CsCl lattice:
- The Cl⁻ ions occupy the corners of the cubic unit cell.
- The Cs⁺ ions are located at the body center of the unit cell.

**Hint:** Visualize the cubic unit cell and remember where each type of ion is placed.

### Step 4: Conclude the Position of Cs⁺ Ions
Since the Cs⁺ ions are located at the body center of the unit cell, we can conclude that the correct answer to the question is that Cs⁺ ions are present at the body center of the unit cell.

**Hint:** Think about how the arrangement of ions affects the overall structure and stability of the crystal.

### Final Answer
In the crystal lattice of CsCl, Cs⁺ ions are present at the **body center of the unit cell**.