Which one of the following statements is wrong about zinc blende type structure ?

Options

A. Each `Zn^(2+)` ion is surrounded tetrahedrally by four `S^(2-)` ions and each `S^(2-)` ion by four `Zn^(2+)` ions
B. `S^(2-)` ions form fcc arrangement
C. AgBr has zinc blende type structure
D. Cuprous halides have zinc blende type structure

Answer

To solve the question regarding which statement is wrong about the zinc blende type structure, we can analyze each option step by step.

### Step 1: Understand the Zinc Blende Structure
The zinc blende structure, also known as sphalerite, is a type of crystal structure commonly associated with compounds like ZnS. In this structure:
- The anions (S²⁻) form a face-centered cubic (FCC) lattice.
- The cations (Zn²⁺) occupy half of the tetrahedral holes in the FCC lattice.

### Step 2: Analyze Each Statement
Now, let's evaluate each of the provided options:

**Option A:** Each Zn²⁺ is surrounded tetrahedrally by 4 S²⁻ ions, and each S²⁻ ion is surrounded by 4 Zn²⁺ ions.
- This statement is **correct**. In the zinc blende structure, each Zn²⁺ ion is indeed surrounded tetrahedrally by 4 S²⁻ ions, and vice versa.

**Option B:** S²⁻ ions form a face-centered cubic arrangement.
- This statement is also **correct**. The S²⁻ ions do form a face-centered cubic arrangement in the zinc blende structure.

**Option C:** AgBr has a zinc blende type structure.
- This statement is **incorrect**. While AgBr does have a crystal structure, it does not adopt the zinc blende structure. Instead, it has a different arrangement.

**Option D:** Cuprous halides have a zinc blende type structure.
- This statement is **correct**. Cuprous halides (like CuCl, CuBr) do exhibit a zinc blende type structure.

### Conclusion
The only statement that is wrong about the zinc blende type structure is **Option C**: "AgBr has a zinc blende type structure."

### Final Answer
**The wrong statement is Option C.**

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