Zinc sulphide exists in two different forms-zinc blende and wurtzite. Both occurs as `4:4` coordination compounds. Choose the correct option from among the following:

Options

A. zinc blende has a bcc structure and wurtzite an fcc structure
B. zinc blende has an fcc structure and wurtizite and hcp structure
C. zinc blende as well as wurtzite have a hcp structure
D. zinc blende as well wurtzite have a hcp structure

Explanation

To solve the question regarding the forms of zinc sulfide (ZnS) and their coordination structures, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Forms of Zinc Sulfide**:
- Zinc sulfide exists in two different forms: Zinc Blende and Wurtzite.

2. **Determine the Coordination Number**:
- Both forms have a coordination number of 4:4, meaning that each zinc ion is coordinated to four sulfur ions and vice versa.

3. **Understand the Crystal Structures**:
- **Zinc Blende**: This form has a face-centered cubic (FCC) structure. In this structure, the sulfur ions form an FCC unit cell, and the zinc ions occupy the tetrahedral voids.
- **Wurtzite**: This form has a hexagonal close packing (HCP) structure. Here, the sulfur ions form an HCP unit cell, with zinc ions also occupying the tetrahedral voids.

4. **Analyze the Options**:
- Option 1 states that Zinc Blende has a body-centered cubic (BCC) structure and Wurtzite has an FCC structure. This is incorrect.
- Option 2 states that Zinc Blende has an FCC structure and Wurtzite has an HCP structure. This is correct.
- Option 3 states that both Zinc Blende and Wurtzite have an HCP structure. This is incorrect.
- Option 4 also states that both forms have an HCP structure, which is incorrect.

5. **Select the Correct Option**:
- Based on the analysis, the correct option is Option 2: Zinc Blende has an FCC structure and Wurtzite has an HCP structure.

### Final Answer:
The correct option is **Option 2**: Zinc Blende has an FCC structure and Wurtzite has an HCP structure.

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