The total number of carbonate ores among the following is.
(i) Argentite (ii) Calamine (iii) Malachite (iv) Siderite (v) Galena
(vi) Magnetite (vii) Dolomite (viii) Cassiterite (ix) Bauxite

Answer

To determine the total number of carbonate ores from the given list, we need to identify which of the listed substances are carbonate ores. A carbonate ore is a naturally occurring mineral that contains carbonate ions (CO3) in its chemical structure.

Let's analyze each of the given substances one by one:

1. **Argentite (Ag2S)**: This is a silver ore and does not contain carbonate ions.
- **Conclusion**: Not a carbonate ore.

2. **Calamine (ZnCO3)**: This is a zinc ore and contains carbonate ions.
- **Conclusion**: This is a carbonate ore.

3. **Malachite (Cu2(CO3)(OH)2)**: This is a copper ore and contains carbonate ions.
- **Conclusion**: This is a carbonate ore.

4. **Siderite (FeCO3)**: This is an iron ore and contains carbonate ions.
- **Conclusion**: This is a carbonate ore.

5. **Galena (PbS)**: This is a lead ore and does not contain carbonate ions.
- **Conclusion**: Not a carbonate ore.

6. **Magnetite (Fe3O4)**: This is an iron ore and does not contain carbonate ions.
- **Conclusion**: Not a carbonate ore.

7. **Dolomite (CaMg(CO3)2)**: This is a carbonate mineral that contains both calcium and magnesium carbonate.
- **Conclusion**: This is a carbonate ore.

8. **Cassiterite (SnO2)**: This is a tin ore and does not contain carbonate ions.
- **Conclusion**: Not a carbonate ore.

9. **Bauxite (Al2O3·2H2O)**: This is an aluminum ore and does not contain carbonate ions.
- **Conclusion**: Not a carbonate ore.

Now, let's summarize the findings:

- Carbonate ores identified:
- Calamine (ZnCO3)
- Malachite (Cu2(CO3)(OH)2)
- Siderite (FeCO3)
- Dolomite (CaMg(CO3)2)

Total number of carbonate ores = 4.

Thus, the answer is **4**.