The metal which mainly occurs as oxide ore in nature is :

Options

A. Silver
B. Lead
C. Aluminium
D. Copper

Answer

To solve the question about which metal mainly occurs as an oxide ore in nature, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Metals and Their Common Ores**:
We need to analyze the given options:
- Silver
- Lead
- Aluminum
- Copper

2. **Research the Occurrence of Each Metal**:
- **Silver**: Typically found in nature as a sulfide ore, specifically argentite (Ag2S).
- **Lead**: Commonly occurs as a sulfide ore known as galena (PbS).
- **Aluminum**: Primarily found as an oxide ore, specifically bauxite, which is mainly composed of aluminum oxide (Al2O3).
- **Copper**: Usually found in sulfide ores, such as chalcopyrite (CuFeS2).

3. **Determine the Metal that Occurs as an Oxide**:
From the analysis, we see that aluminum is the only metal that is primarily found as an oxide ore (bauxite).

4. **Conclusion**:
Therefore, the metal which mainly occurs as an oxide ore in nature is **Aluminum**.

### Final Answer:
The correct option is **Aluminum** (Option 3).

---