Which of the following on thermal decomposition yields a basic as well as an acidic oxide?

Options

A. `KClO_(3)`
B. `Na_(2)CO_(3)`
C. `NaNO_(3)`
D. `CaCO_(3)`

Explanation

To solve the question of which compound, upon thermal decomposition, yields both a basic oxide and an acidic oxide, we can analyze the given options step by step:

### Step 1: Understanding Thermal Decomposition
Thermal decomposition is a chemical reaction where a single compound breaks down into two or more products when heated. We need to identify the products formed from the thermal decomposition of each compound listed.

### Step 2: Analyze Each Compound
1. **KClO3 (Potassium Chlorate)**
- Upon heating, KClO3 decomposes to form:
\[ 2 \text{KClO}_3 \rightarrow 2 \text{KCl} + 3 \text{O}_2 \]
- The products are KCl (which is a salt) and O2 (a gas). No basic or acidic oxides are formed here.

2. **Na2CO3 (Sodium Carbonate)**
- Upon heating, Na2CO3 decomposes to form:
\[ \text{Na}_2\text{CO}_3 \rightarrow \text{Na}_2\text{O} + \text{CO}_2 \]
- Here, Na2O is a basic oxide and CO2 is an acidic oxide. This option yields both types of oxides.

3. **NaNO3 (Sodium Nitrate)**
- Upon heating, NaNO3 decomposes to form:
\[ 2 \text{NaNO}_3 \rightarrow 2 \text{NaNO}_2 + \text{O}_2 \]
- The products are NaNO2 and O2. Again, no basic or acidic oxides are formed.

4. **CaCO3 (Calcium Carbonate)**
- Upon heating, CaCO3 decomposes to form:
\[ \text{CaCO}_3 \rightarrow \text{CaO} + \text{CO}_2 \]
- In this case, CaO is a basic oxide and CO2 is an acidic oxide. This option also yields both types of oxides.

### Step 3: Conclusion
From the analysis, we find that:
- **Na2CO3** yields a basic oxide (Na2O) and an acidic oxide (CO2).
- **CaCO3** also yields a basic oxide (CaO) and an acidic oxide (CO2).

Thus, the correct answers are **Na2CO3** and **CaCO3**.

### Final Answer:
The compounds that yield a basic as well as an acidic oxide upon thermal decomposition are **Na2CO3** and **CaCO3**.

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