Concentrated ore, calamine is heated to get metal oxide and the volatile impurities escapes away. This process is called

Options

A. Roasting
B. Calcination
C. Reduction
D. Oxidation

Answer

To solve the question regarding the process used when heating concentrated ore calamine to obtain metal oxide while volatile impurities escape, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Ore**:
- Calamine is identified as an ore of zinc. Historically, it is known as zinc carbonate (ZnCO₃).

2. **Understand the Heating Process**:
- When calamine (zinc carbonate) is heated, it undergoes a thermal decomposition reaction. This reaction produces zinc oxide (ZnO) and releases carbon dioxide (CO₂) as a volatile impurity.

3. **Write the Reaction**:
- The chemical reaction can be represented as:
\[ \text{ZnCO}_3 (s) \rightarrow \text{ZnO} (s) + \text{CO}_2 (g) \]
- Here, zinc oxide is the metal oxide formed, and carbon dioxide is the volatile impurity that escapes.

4. **Determine the Process Used**:
- The process of heating carbonate ores to convert them into oxides is known as **calcination**. This process typically occurs in the absence or limited supply of air.

5. **Differentiate Between Calcination and Roasting**:
- It is important to note that calcination is specifically used for carbonate ores, while roasting is used for sulfide ores. Since calamine is a carbonate ore, the correct process is calcination.

6. **Conclusion**:
- Therefore, the process of heating concentrated ore calamine to obtain metal oxide while volatile impurities escape is called **calcination**.

### Final Answer:
The process is called **calcination**.

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