The carbonate that will not decompose on heating is

Options

A. `Na_(2)CO_(3)`
B. `CaCO_(3)`
C. `SrCO_(3)`
D. `BaCO_(3)`

Explanation

To determine which carbonate does not decompose upon heating, we can analyze the stability of the carbonates provided in the options: sodium carbonate (Na2CO3), calcium carbonate (CaCO3), strontium carbonate (SrCO3), and barium carbonate (BaCO3).

### Step-by-Step Solution:

1. **Identify the Carbonates**:
We have four carbonates to consider:
- Sodium carbonate (Na2CO3)
- Calcium carbonate (CaCO3)
- Strontium carbonate (SrCO3)
- Barium carbonate (BaCO3)

2. **Understand Decomposition of Carbonates**:
Generally, carbonates of alkali metals (Group 1) are more stable than those of alkaline earth metals (Group 2). When heated, many carbonates decompose into their respective oxides and carbon dioxide (CO2).

3. **Analyze Sodium Carbonate (Na2CO3)**:
Sodium carbonate is derived from sodium bicarbonate (NaHCO3) upon heating. It is already in a stable form and does not decompose further upon heating.

4. **Analyze Calcium Carbonate (CaCO3)**:
Calcium carbonate decomposes when heated to form calcium oxide (CaO) and carbon dioxide (CO2). This is a common reaction known as thermal decomposition.

5. **Analyze Strontium Carbonate (SrCO3)**:
Similar to calcium carbonate, strontium carbonate also decomposes upon heating to produce strontium oxide (SrO) and carbon dioxide (CO2).

6. **Analyze Barium Carbonate (BaCO3)**:
Barium carbonate also undergoes decomposition when heated, yielding barium oxide (BaO) and carbon dioxide (CO2).

7. **Conclusion**:
Among the carbonates analyzed, sodium carbonate (Na2CO3) is the only one that does not decompose upon heating. Therefore, the answer to the question is:
- **The carbonate that will not decompose on heating is sodium carbonate (Na2CO3)**.

### Final Answer:
**Option A: Sodium carbonate (Na2CO3)**