By burning `NH_(3)` in oxygen, it gives __________and `H_(2)O`.

Options

A. NO
B. `N_(2)`
C. `NO_(2)`
D. `N_(2)O`

Answer

To solve the question "By burning NH₃ in oxygen, it gives __________ and H₂O," we need to understand the combustion reaction of ammonia (NH₃) in the presence of oxygen (O₂).

### Step-by-Step Solution:

1. **Identify the Reactants**:
The reactants in this reaction are ammonia (NH₃) and oxygen (O₂).

2. **Write the General Reaction**:
The general form of the combustion reaction can be written as:
\[ \text{NH}_3 + \text{O}_2 \rightarrow \text{Products} \]

3. **Determine the Possible Products**:
When ammonia burns in oxygen, it can produce different nitrogen oxides depending on the conditions. The common products are:
- Nitric oxide (NO)
- Dinitrogen (N₂)
- Water (H₂O)

4. **Consider the Conditions**:
- If a catalyst is used, the reaction may produce NO along with H₂O.
- Without a catalyst and under certain conditions, the reaction primarily produces dinitrogen (N₂) and water (H₂O).

5. **Write the Balanced Reaction**:
For the case where NH₃ burns completely in excess oxygen without a catalyst, the balanced reaction is:
\[ 4 \text{NH}_3 + 3 \text{O}_2 \rightarrow 2 \text{N}_2 + 6 \text{H}_2O \]

6. **Fill in the Blank**:
From the balanced equation, we can see that when ammonia is burned in oxygen, it produces dinitrogen (N₂) and water (H₂O). Therefore, the blank should be filled with:
\[ \text{N}_2 \]

### Final Answer:
By burning NH₃ in oxygen, it gives **N₂** and H₂O.

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