A hydride of nitrogen which is acidic is

Options

A. `NH_3`
B. `N_2 H_4`
C. `N_2 H_2`
D. `N_3 H`

Explanation

To determine the hydride of nitrogen that is acidic, we can follow these steps:

### Step 1: Identify the hydrides of nitrogen
The common hydrides of nitrogen include:
- Ammonia (NH₃)
- Hydrazine (N₂H₄)
- Nitrogen trihydride (N₃H, also known as hydrozoic acid)

### Step 2: Analyze the nature of each hydride
- **Ammonia (NH₃)**: It is known to be a basic compound. It can accept protons (H⁺) and thus acts as a base.
- **Hydrazine (N₂H₄)**: This compound is also not acidic; it behaves more like a weak base.
- **Hydrozoic acid (N₃H)**: This compound is known to be acidic. It can donate protons (H⁺) and forms the azide ion (N₃⁻) when it dissociates.

### Step 3: Conclusion
Among the hydrides of nitrogen mentioned, hydrozoic acid (N₃H) is the only one that exhibits acidic properties.

### Final Answer
The hydride of nitrogen which is acidic is hydrozoic acid (N₃H).

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