`NH_3` burns in air under suitable conditions to produce

Options

A. `N_2`
B. `NO`
C. `N_2O`
D. `N_2O_3`

Answer

To determine what products are formed when ammonia (`NH_3`) burns in air, we can follow these steps:

### Step 1: Identify the reactants
The reactant in this case is ammonia (`NH_3`). When it burns, it reacts with oxygen (`O_2`) present in the air.

### Step 2: Write the combustion reaction
The combustion of ammonia can be represented by the following chemical equation:
\[ 4 \, NH_3 + 3 \, O_2 \rightarrow 2 \, N_2 + 6 \, H_2O \]
This equation indicates that four moles of ammonia react with three moles of oxygen to produce two moles of nitrogen gas and six moles of water.

### Step 3: Identify the products
From the balanced equation, we can see that the products of the combustion of ammonia are:
- Nitrogen gas (`N_2`)
- Water (`H_2O`)

### Step 4: Conclusion
Therefore, when ammonia burns in air, it produces nitrogen gas and water. The correct answer to the question is that ammonia burns in air to produce nitrogen gas.