Which one of the following types of ores can be converted into oxide by calcination?

Options

A. Halide ores
B. Carbonate ores
C. Fluoride ores
D. All of these

Answer

To determine which type of ore can be converted into its oxide by calcination, we need to understand the calcination process and the types of ores involved.

### Step-by-Step Solution:

1. **Understanding Calcination**:
- Calcination is a thermal treatment process that involves heating ores in the absence of air. The primary purpose of calcination is to remove volatile components and convert metal carbonates into metal oxides.

2. **Types of Ores**:
- Ores can generally be classified into different types, such as:
- Metal carbonates (e.g., calcium carbonate, magnesium carbonate)
- Metal sulfides (e.g., zinc sulfide, copper sulfide)
- Metal oxides (already in oxide form)
- Metal silicates (e.g., silicate ores)

3. **Focus on Metal Carbonates**:
- The calcination process specifically applies to metal carbonate ores. When these ores are heated, they decompose to form metal oxides and carbon dioxide gas.
- For example, when calcium carbonate (CaCO₃) is calcined, it decomposes into calcium oxide (CaO) and carbon dioxide (CO₂).

4. **Conclusion**:
- Therefore, the type of ore that can be converted into its oxide by calcination is **metal carbonate ores**.

### Final Answer:
Metal carbonate ores can be converted into their oxides by calcination.

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