How many of the following are oxide ores
Calamine,cuprite,zinxite, chalcocite,haematite, bauxite,magnetite,cassiterite.

Explanation

To determine how many of the given compounds are oxide ores, we will analyze each compound by looking at their chemical formulas. An oxide ore is characterized by the presence of oxygen in its formula, typically in the form of metal oxides.

### Step-by-Step Solution:

1. **Calamine**: The formula for calamine is \( \text{ZnO} \cdot \text{Fe}_2\text{O}_3 \). Since it contains oxygen, calamine is an oxide ore.

2. **Cuprite**: The formula for cuprite is \( \text{Cu}_2\text{O} \). This compound also contains oxygen, making cuprite an oxide ore.

3. **Zincite**: The formula for zincite is \( \text{ZnO} \). It contains oxygen, so zincite is an oxide ore.

4. **Chalcocite**: The formula for chalcocite is \( \text{Cu}_2\text{S} \). This compound does not contain oxygen, so chalcocite is not an oxide ore.

5. **Hematite**: The formula for hematite is \( \text{Fe}_2\text{O}_3 \). It contains oxygen, confirming that hematite is an oxide ore.

6. **Bauxite**: The formula for bauxite is \( \text{Al}_2\text{O}_3 \cdot 2\text{H}_2\text{O} \). It contains oxygen, so bauxite is an oxide ore.

7. **Magnetite**: The formula for magnetite is \( \text{Fe}_3\text{O}_4 \). This compound contains oxygen, making magnetite an oxide ore.

8. **Cassiterite**: The formula for cassiterite is \( \text{SnO}_2 \). It contains oxygen, confirming that cassiterite is an oxide ore.

### Summary of Findings:
- **Oxide Ores**: Calamine, Cuprite, Zincite, Hematite, Bauxite, Magnetite, Cassiterite.
- **Not an Oxide Ore**: Chalcocite.

### Conclusion:
Out of the eight compounds listed, **seven** are oxide ores.