Hydrogen reacts with this element to form ammonia

Options

A. Sulphur
B. Carbon
C. Oxygen
D. Nitrogen

Explanation

To solve the question, we need to identify which element reacts with hydrogen to form ammonia (NH3). Let's go through the options step by step.

### Step-by-Step Solution:

1. **Identify the reaction for ammonia formation**:
Ammonia is formed when hydrogen reacts with nitrogen. The chemical equation for this reaction is:
\[ N_2 + 3H_2 \rightarrow 2NH_3 \]
This means that one molecule of nitrogen gas (N2) reacts with three molecules of hydrogen gas (H2) to produce two molecules of ammonia (NH3).

2. **Evaluate the options**:
- **Option 1: Sulfur (S)**
The reaction would be:
\[ H_2 + S \rightarrow H_2S \]
This produces hydrogen sulfide (H2S), not ammonia.
**Conclusion**: This option is incorrect.

- **Option 2: Carbon (C)**
The reaction would be:
\[ H_2 + C \rightarrow CH_2 \]
This produces methylene (CH2), not ammonia.
**Conclusion**: This option is incorrect.

- **Option 3: Oxygen (O)**
The reaction would be:
\[ H_2 + O_2 \rightarrow H_2O \]
This produces water (H2O), not ammonia.
**Conclusion**: This option is incorrect.

- **Option 4: Nitrogen (N)**
The reaction would be:
\[ N_2 + 3H_2 \rightarrow 2NH_3 \]
This produces ammonia (NH3).
**Conclusion**: This option is correct.

3. **Final Answer**: The element that reacts with hydrogen to form ammonia is **Nitrogen (N)**.