Which one of the following reactions is an example for calcination process

Options

A. `2Ag + 2 HCl + (O) to 2 AgCl + H_(2)O`
B. `2 Zn + O_(2) to 2 ZnO`
C. `2 ZnS + 3 O_(2) to 2 Zn O + 2 SO_(2)`
D. `MgCO_(3) to MgO + CO_(3)`

Answer

To determine which reaction is an example of the calcination process, we first need to understand what calcination is.

### Step-by-Step Solution:

1. **Definition of Calcination**:
- Calcination is the process of heating a solid compound to a high temperature in the absence or limited supply of air or oxygen. This process is typically used to remove impurities or volatile substances and can also lead to thermal decomposition of the compound.

2. **Identifying the Reaction**:
- We need to analyze the given options for reactions that fit the definition of calcination. The key points to look for are:
- The reaction should occur in the absence or limited supply of air/oxygen.
- The reaction should involve thermal decomposition.

3. **Analyzing the Options**:
- Let's consider the reaction of magnesium carbonate (MgCO3):
- The reaction can be represented as:
\[ \text{MgCO}_3 \rightarrow \text{MgO} + \text{CO}_2 \]
- In this reaction, magnesium carbonate decomposes into magnesium oxide (MgO) and carbon dioxide (CO2). This reaction occurs when MgCO3 is heated, and it does so in the absence of air or limited oxygen supply.

4. **Conclusion**:
- Since the reaction of MgCO3 meets the criteria of calcination (thermal decomposition in the absence of air), we conclude that this is indeed an example of a calcination process.

### Final Answer:
The reaction that is an example of the calcination process is:
\[ \text{MgCO}_3 \rightarrow \text{MgO} + \text{CO}_2 \]