The compound which is not formed on heating `Be(NO_3)_2` is

Options

A. `N_2O`
B. `O_2`
C. `NO_2`
D. `BeO`

Answer

To solve the question regarding the compound that is not formed when heating beryllium nitrate \((Be(NO_3)_2)\), we need to analyze the thermal decomposition of beryllium nitrate.

### Step-by-Step Solution:

1. **Identify the Compound**: The compound in question is beryllium nitrate, which has the chemical formula \(Be(NO_3)_2\).

2. **Understand the Heating Process**: When beryllium nitrate is heated, it undergoes thermal decomposition. This means that it breaks down into simpler substances when subjected to heat.

3. **Write the Decomposition Reaction**: The thermal decomposition of beryllium nitrate can be represented by the following reaction:
\[ 2 Be(NO_3)_2 \rightarrow 2 BeO + 4 NO_2 + O_2 \]
Here, beryllium oxide \((BeO)\), nitrogen dioxide \((NO_2)\), and oxygen gas \((O_2)\) are formed.

4. **Analyze the Options**: The question asks for the compound that is **not formed** during this decomposition. The products formed are:
- Beryllium oxide \((BeO)\)
- Nitrogen dioxide \((NO_2)\)
- Oxygen gas \((O_2)\)

5. **Identify the Incorrect Option**: If the options provided include compounds like \(N_2O\) (nitrous oxide), we can see that this compound is not listed among the products formed during the decomposition of beryllium nitrate.

6. **Conclusion**: Therefore, the compound that is not formed on heating \(Be(NO_3)_2\) is \(N_2O\).

### Final Answer:
The compound which is not formed on heating \(Be(NO_3)_2\) is \(N_2O\).