Write two uses of interstitial hydrides .

Explanation

**Step-by-Step Solution:**

1. **Define Interstitial Hydrides:**
Interstitial hydrides are compounds formed when small atoms, such as hydrogen, occupy the interstitial spaces (the gaps) between the larger atoms in a metal lattice. This typically occurs in metals from the d-block and f-block of the periodic table.

2. **Identify Uses of Interstitial Hydrides:**
- **Use 1: Hydrogen Storage**
Interstitial hydrides are used for storing hydrogen gas. They can absorb hydrogen and release it under certain conditions, making them useful for hydrogen storage applications in fuel cells and other technologies.
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