Which of the following is an example of interstitial hydride?

Options

A. `NH_(3)`
B. `CH_(4)`
C. `ZnH_(2)`
D. `H_(2)O`

Answer

To determine which of the given options is an example of an interstitial hydride, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Definition of Interstitial Hydrides**:
- Interstitial hydrides are hydrides formed by transition metals, specifically D and F block elements. These hydrides have hydrogen atoms occupying the interstitial spaces in the metal lattice.

2. **Identify the Types of Hydrides**:
- **Ionic Hydrides**: Formed by S-block elements (e.g., NaH, LiH).
- **Covalent Hydrides**: Formed by P-block elements (e.g., NH3, CH4, H2O).
- **Interstitial Hydrides**: Formed by D and F block elements (e.g., ZnH2).

3. **Analyze the Given Options**:
- **Option A: Ammonia (NH3)**: This is a covalent hydride formed by nitrogen, a P-block element.
- **Option B: Methane (CH4)**: This is also a covalent hydride formed by carbon, a P-block element.
- **Option C: Water (H2O)**: This is a covalent hydride formed by oxygen, a P-block element.
- **Option D: Zinc Hydride (ZnH2)**: This is formed by zinc, which is a D block element.

4. **Identify the Correct Answer**:
- Since ammonia, methane, and water are all covalent hydrides formed by P-block elements, they do not qualify as interstitial hydrides. The only option that qualifies as an interstitial hydride is **Zinc Hydride (ZnH2)**.

### Conclusion:
The correct answer is **Zinc Hydride (ZnH2)**, which is an example of an interstitial hydride.

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