Beryllium on ignition in air gives

Options

A. BeO
B. `Be_(3)N_(2)`
C. Both (a) & (b)
D. BeC

Answer

To solve the question "Beryllium on ignition in air gives," we need to analyze the reaction of beryllium when it is ignited in the presence of air.

### Step-by-step Solution:

1. **Understanding Beryllium**:
- Beryllium (Be) is an alkaline earth metal that is known for its ability to react with oxygen and nitrogen when ignited.

2. **Identifying the Reaction with Oxygen**:
- When beryllium is ignited in air, it reacts with oxygen to form beryllium oxide (BeO).
- The reaction can be represented as:
\[ 2 \text{Be} + \text{O}_2 \rightarrow 2 \text{BeO} \]

3. **Identifying the Reaction with Nitrogen**:
- In addition to reacting with oxygen, beryllium can also react with nitrogen present in the air to form beryllium nitride (Be3N2).
- The reaction can be represented as:
\[ 3 \text{Be} + \text{N}_2 \rightarrow \text{Be}_3\text{N}_2 \]

4. **Conclusion**:
- Therefore, upon ignition in air, beryllium produces both beryllium oxide (BeO) and beryllium nitride (Be3N2).
- The correct answer to the question is that beryllium on ignition in air gives both BeO and Be3N2.

5. **Final Answer**:
- The correct option is "both A and B" (BeO and Be3N2).