On heating aluminium nitrate forms oxides of nitrogen and aluminium. The oxides formed are:

Answer

To solve the question regarding the thermal decomposition of aluminum nitrate and the oxides formed, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Compound**: The compound in question is aluminum nitrate, which has the chemical formula \( \text{Al(NO}_3\text{)}_3 \).

2. **Understand Thermal Decomposition**: When aluminum nitrate is heated, it undergoes thermal decomposition. This means it breaks down into simpler substances when exposed to heat.

3. **Determine the Products of Decomposition**: The decomposition of aluminum nitrate typically produces aluminum oxide (\( \text{Al}_2\text{O}_3 \)), nitrogen dioxide (\( \text{NO}_2 \)), and oxygen gas (\( \text{O}_2 \)).

4. **Write the Balanced Chemical Equation**: The balanced equation for the thermal decomposition of aluminum nitrate can be represented as:
\[ 4 \text{Al(NO}_3\text{)}_3 \rightarrow 2 \text{Al}_2\text{O}_3 + 12 \text{NO}_2 + 3 \text{O}_2 \]

5. **Identify the Oxides Formed**: From the balanced equation, we can see that the oxides formed are:
- **Aluminum Oxide**: \( \text{Al}_2\text{O}_3 \)
- **Nitrogen Dioxide**: \( \text{NO}_2 \)
- Additionally, oxygen gas (\( \text{O}_2 \)) is also produced, but it is not an oxide of nitrogen or aluminum.

### Conclusion:
The oxides formed upon heating aluminum nitrate are:
- **Aluminum Oxide**: \( \text{Al}_2\text{O}_3 \)
- **Nitrogen Dioxide**: \( \text{NO}_2 \)