Which of the following is/are oxide ores?

Options

A. Cassiterite
B. Bauxite
C. Chromite
D. Dolomite

Explanation

To determine which of the given ores are oxide ores, we will analyze each option provided in the question.

### Step-by-Step Solution:

1. **Identify the first ore: Cassiterite**
- Cassiterite is represented by the chemical formula SnO2.
- Since it contains oxygen and is an oxide of tin, it qualifies as an oxide ore.

2. **Identify the second ore: Bauxite**
- Bauxite is represented by the chemical formula Al2O3.
- This compound is an oxide of aluminum, thus it is also classified as an oxide ore.

3. **Identify the third ore: Chromite**
- Chromite has the chemical formula FeCr2O4.
- This compound contains iron and chromium oxides, making it an oxide ore as well.

4. **Identify the fourth ore: Dolomite**
- Dolomite is represented by the chemical formula CaMg(CO3)2.
- This is a carbonate ore, not an oxide ore, as it does not contain oxygen in the form of an oxide.

### Conclusion:
- The ores that are classified as oxide ores are:
- Cassiterite (SnO2)
- Bauxite (Al2O3)
- Chromite (FeCr2O4)

- Dolomite (CaMg(CO3)2) is **not** an oxide ore.

### Final Answer:
The oxide ores among the given options are:
- A) Cassiterite (SnO2)
- B) Bauxite (Al2O3)
- C) Chromite (FeCr2O4)