The ore that contains the metal in the form of fuoride is :

Options

A. cryolite
B. malachite
C. magnetite
D. sphalerite

Answer

To solve the question of identifying the ore that contains the metal in the form of fluoride, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Ores and Their Formulas**:
- **Cryolite**: The formula is \( \text{Na}_3\text{AlF}_6 \).
- **Malachite**: The formula is \( \text{Cu}_2\text{CO}_3\text{(OH)}_2 \).
- **Magnetite**: The formula is \( \text{Fe}_3\text{O}_4 \).
- **Sphalerite**: The formula is \( \text{ZnS} \) (though the mention of iron is incorrect, as sphalerite primarily contains zinc).

2. **Analyze the Formulas for Fluoride**:
- Look for the presence of fluorine (F) in the chemical formulas.
- **Cryolite** contains fluorine in its formula \( \text{Na}_3\text{AlF}_6 \).
- **Malachite**, **Magnetite**, and **Sphalerite** do not contain fluorine.

3. **Conclusion**:
- Since only cryolite contains fluorine in its composition, we conclude that the ore that contains the metal in the form of fluoride is **cryolite**.

### Final Answer:
The ore that contains the metal in the form of fluoride is **cryolite** (option A).