Commercially important ore of Lead is

Options

A. Haematite
B. Sphalerite
C. Siderite
D. Galena

Answer

To determine the commercially important ore of lead, we need to analyze the given options and identify which one contains lead as a primary component.

### Step-by-Step Solution:

1. **Identify the Options**: We have four options to evaluate:
- Hematite
- Sphalerite
- Sidrite
- Galena

2. **Analyze Each Option**:
- **Hematite**: This is an iron oxide with the chemical formula \( \text{Fe}_2\text{O}_3 \). It is primarily an ore of iron, not lead.
- **Sphalerite**: This is zinc sulfide with the formula \( \text{ZnS} \). It is primarily an ore of zinc, not lead.
- **Sidrite**: This is iron carbonate with the formula \( \text{FeCO}_3 \). It is also primarily an ore of iron, not lead.
- **Galena**: This is lead(II) sulfide with the formula \( \text{PbS} \). It is the primary ore of lead.

3. **Conclusion**: Among the options provided, Galena is the only ore that is primarily associated with lead. Therefore, the commercially important ore of lead is **Galena**.

### Final Answer:
The commercially important ore of lead is **Galena**.