Extraction of zinc from zinc blende

Options

A. Electrolytic reduction
B. Roasting followed by reduction with carbon
C. Calcination followed by reduction with carbon
D. Roasting followed by self reduction

Answer

### Step-by-Step Solution for Extraction of Zinc from Zinc Blende

1. **Identify the Ore**: Zinc blende is the ore of zinc, which is chemically represented as ZnS (zinc sulfide).

2. **Roasting Process**: The first step in the extraction of zinc from zinc blende is roasting. Roasting involves heating the ore in the presence of excess air. This process converts zinc sulfide (ZnS) into zinc oxide (ZnO) and sulfur dioxide (SO₂) gas. The reaction can be represented as:
\[ 2 \text{ZnS} + 3 \text{O}_2 \rightarrow 2 \text{ZnO} + 2 \text{SO}_2 \]

3. **Reduction of Zinc Oxide**: After obtaining zinc oxide, the next step is to reduce zinc oxide to zinc metal. This is typically done using carbon as a reducing agent. The reaction is as follows:
\[ \text{ZnO} + \text{C} \rightarrow \text{Zn} + \text{CO} \]
Here, carbon monoxide (CO) is produced as a byproduct.

4. **Final Product**: The final product of this process is pure zinc metal, which can be collected and used for various applications.

5. **Conclusion**: Therefore, the correct method for the extraction of zinc from zinc blende is roasting followed by reduction with carbon.

### Final Answer
The correct option for the extraction of zinc from zinc blende is **roasting followed by reduction with carbon**.

---