Which of the following ore is/are oxide ore (s) ?

Options

A. Cassiterite
B. Bauxite
C. Cryolite
D. Haematite

Explanation

To determine which of the given ores are oxide ores, we will analyze each option based on their chemical formulas and definitions of oxide ores.

### Step-by-Step Solution:

1. **Understanding Oxide Ores**:
- Oxide ores are minerals from which metals can be extracted, and they contain metals in the form of oxides. Common examples include ores with formulas that include oxygen combined with metals.

2. **Analyzing the Options**:
- We will evaluate each ore provided in the options to see if they are oxide ores.

3. **Option 1: Cassiterite (SnO2)**:
- The formula for cassiterite is SnO2.
- This indicates that it is an oxide of tin (Sn), which qualifies it as an oxide ore.
- **Conclusion**: Cassiterite is an oxide ore.

4. **Option 2: Bauxite (Al2O3·2H2O)**:
- The formula for bauxite is Al2O3·2H2O.
- This shows that it contains aluminum oxide (Al2O3) along with water molecules, making it a hydrated oxide.
- **Conclusion**: Bauxite is also an oxide ore.

5. **Option 3: Cryolite (Na3AlF6)**:
- The formula for cryolite is Na3AlF6.
- This compound does not contain oxygen in the form of an oxide; instead, it contains fluorine.
- **Conclusion**: Cryolite is not an oxide ore.

6. **Option 4: Hematite (Fe2O3)**:
- The formula for hematite is Fe2O3.
- This indicates that it is an oxide of iron (Fe), qualifying it as an oxide ore.
- **Conclusion**: Hematite is an oxide ore.

7. **Final Conclusion**:
- The ores that are classified as oxide ores from the options given are:
- Cassiterite (SnO2)
- Bauxite (Al2O3·2H2O)
- Hematite (Fe2O3)

### Answer:
The oxide ores from the given options are Cassiterite, Bauxite, and Hematite.