Which one of the following on heating will not give `CO_(2)`

Options

A. `CaCO_(3)`
B. `Na_(2)CO_(3)`
C. `PbCO_(3)`
D. `Li_(2)CO_(3)`

Answer

To solve the question "Which one of the following on heating will not give CO2?", we need to analyze the thermal stability of various carbonates. Here’s a step-by-step breakdown:

### Step 1: Understand the question
We need to identify which carbonate does not release carbon dioxide (CO2) when heated. Generally, carbonates decompose upon heating to release CO2, but the stability of the carbonate plays a crucial role in this process.

### Step 2: Identify the carbonates
Common carbonates include:
- K2CO3 (Potassium carbonate)
- Na2CO3 (Sodium carbonate)
- CaCO3 (Calcium carbonate)
- Li2CO3 (Lithium carbonate)

### Step 3: Analyze the thermal stability of carbonates
The thermal stability of carbonates varies based on the metal ion present:
- **K2CO3**: Potassium carbonate is relatively stable and does not decompose easily.
- **Na2CO3**: Sodium carbonate is also thermally stable and does not decompose upon heating.
- **CaCO3**: Calcium carbonate decomposes upon heating to produce CaO and CO2.
- **Li2CO3**: Lithium carbonate is the least stable and decomposes to produce CO2 upon heating.

### Step 4: Determine which carbonate does not release CO2
From the analysis:
- K2CO3 and Na2CO3 are stable and do not release CO2 upon heating.
- CaCO3 and Li2CO3 decompose and release CO2.

### Conclusion
The carbonates that do not give CO2 upon heating are K2CO3 and Na2CO3. However, since the question asks for one specific answer, we can conclude that **Na2CO3 (Sodium carbonate)** is the most commonly recognized stable carbonate that does not release CO2 upon heating.

### Final Answer
**Na2CO3 (Sodium carbonate)** will not give CO2 when heated.

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