Which of the following does not give an oxide on hetaing-

Options

A. `MgCO_(3)`
B. `Li_(2)CO_(3)`
C. `ZnCO_(3)`
D. `K_(2)CO_(3)`

Answer

To solve the question "Which of the following does not give an oxide on heating?", we will analyze the given compounds one by one to determine their behavior upon heating.

### Step-by-Step Solution:

1. **Identify the Compounds**: The question involves several compounds, including MgCO3, Li2CO3, ZnCO3, and K2CO3. We need to check each one to see if they produce an oxide when heated.

2. **Analyze MgCO3 (Magnesium Carbonate)**:
- When heated, magnesium carbonate decomposes:
\[ \text{MgCO}_3 \rightarrow \text{MgO} + \text{CO}_2 \]
- It produces magnesium oxide (MgO) and carbon dioxide (CO2). Thus, MgCO3 gives an oxide on heating.

3. **Analyze Li2CO3 (Lithium Carbonate)**:
- When lithium carbonate is heated, it also decomposes:
\[ \text{Li}_2\text{CO}_3 \rightarrow \text{Li}_2\text{O} + \text{CO}_2 \]
- It produces lithium oxide (Li2O) and carbon dioxide (CO2). Therefore, Li2CO3 gives an oxide on heating.

4. **Analyze ZnCO3 (Zinc Carbonate)**:
- Zinc carbonate decomposes upon heating as well:
\[ \text{ZnCO}_3 \rightarrow \text{ZnO} + \text{CO}_2 \]
- It produces zinc oxide (ZnO) and carbon dioxide (CO2). Thus, ZnCO3 gives an oxide on heating.

5. **Analyze K2CO3 (Potassium Carbonate)**:
- Potassium carbonate is known for its thermal stability. When heated, it does not decompose:
\[ \text{K}_2\text{CO}_3 \text{ does not decompose.} \]
- Since it does not decompose, it does not produce any oxide. Therefore, K2CO3 does not give an oxide on heating.

### Conclusion:
The compound that does not give an oxide on heating is **K2CO3 (Potassium Carbonate)**.