Extraction of zinc from zinc blende is achieved by:

Options

A. Roasting followed by reduction with carbon
B. Roasting followed by reduction with another metal
C. Electrolytic reduction
D. Roasting followed by self - reduction

Answer

To extract zinc from zinc blende (ZnS), the process involves two main steps: roasting and reduction. Here’s a step-by-step breakdown of the extraction process:

### Step 1: Roasting
- **Process**: The zinc blende (ZnS) is heated in the presence of oxygen (O2).
- **Chemical Reaction**:
\[ 2 \text{ZnS} + 3 \text{O}_2 \rightarrow 2 \text{ZnO} + 2 \text{SO}_2 \]
- **Explanation**: During roasting, zinc sulfide (ZnS) is converted into zinc oxide (ZnO) and sulfur dioxide (SO2). This step removes sulfur and converts the sulfide to an oxide.

### Step 2: Reduction
- **Process**: The zinc oxide (ZnO) obtained from the roasting step is then reduced using carbon (C).
- **Chemical Reaction**:
\[ \text{ZnO} + \text{C} \rightarrow \text{Zn} + \text{CO} \]
- **Explanation**: At high temperatures (greater than 1270 K), zinc oxide reacts with carbon to produce zinc metal (Zn) and carbon monoxide (CO). This step is crucial as it reduces the oxide to its elemental form.

### Conclusion
The extraction of zinc from zinc blende is achieved by **roasting followed by reduction with carbon**. Therefore, the correct answer is:
**Option A: Roasting followed by reduction with carbon.**

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