Which of the following ores contains fluorine ?

Options

A. Malachite
B. Sphalerite
C. Cryolite
D. Bauxite

Answer

To determine which of the given ores contains fluorine, we will analyze each option one by one.

### Step-by-Step Solution:

1. **Understanding Ores**:
- An ore is a naturally occurring solid material from which a metal or valuable mineral can be extracted profitably.

2. **Identifying the Ores**:
- We have four ores to analyze:
- Malachite
- Sphalerite
- Cryolite
- Bauxite

3. **Analyzing Each Ore**:
- **Malachite**:
- Chemical formula: \( \text{Cu}_2\text{CO}_3\text{(OH)}_2 \)
- Contains copper and carbonate, but no fluorine.
- **Sphalerite**:
- Chemical formula: \( \text{ZnS} \)
- Contains zinc and sulfur, but no fluorine.
- **Cryolite**:
- Chemical formula: \( \text{Na}_3\text{AlF}_6 \)
- Contains sodium, aluminum, and fluorine. This is the only ore in the list that contains fluorine.
- **Bauxite**:
- Chemical formula: \( \text{Al}_2\text{O}_3 \cdot \text{nH}_2\text{O} \) (where n can vary)
- Contains aluminum and water, but no fluorine.

4. **Conclusion**:
- Among the ores listed, only **Cryolite** contains fluorine.

### Final Answer:
The ore that contains fluorine is **Cryolite**.

---