Which of the following statement is correct about dinitrogen?

Options

A. `N_2` is a diatomic molecule
B. Hydrogen bonding is absent in `NH_3`
C. Nitrogen shows covalency of 3
D. Nitrogen is chemically inert

Explanation

To determine which statement is correct about dinitrogen (N2), let's analyze the provided information step by step.

### Step 1: Understanding Dinitrogen
Dinitrogen (N2) is a molecule composed of two nitrogen atoms. It is important to recognize that it is a diatomic molecule.

### Step 2: Evaluating the Statements
1. **N2 is a diatomic molecule.**
- This statement is correct because N2 consists of two nitrogen atoms.

2. **Hydrogen bonding is absent in NH3.**
- This statement is incorrect. Ammonia (NH3) does exhibit hydrogen bonding due to the presence of nitrogen, which is highly electronegative.

3. **Nitrogen has a covalence of 3.**
- This statement is also correct. Nitrogen can form three covalent bonds (as in NH3 or NF3) to complete its octet.

4. **Nitrogen is chemically inert.**
- This statement is somewhat misleading. While N2 is relatively inert due to its strong triple bond (bond order of 3), nitrogen itself can react under certain conditions.

### Step 3: Conclusion
From the evaluation:
- The correct statements about dinitrogen are:
- N2 is a diatomic molecule (Statement 1).
- Nitrogen has a covalence of 3 (Statement 3).

### Final Answer
The correct statements about dinitrogen are:
- Statement 1: N2 is a diatomic molecule.
- Statement 3: Nitrogen has a covalence of 3.