How is `H_2 O_2` stored ?

Explanation

**Step-by-Step Solution:**

1. **Understanding the Nature of Hydrogen Peroxide (H₂O₂):**
- Hydrogen peroxide is known to be an unstable compound. It tends to decompose over time, especially when exposed to light and heat.

2. **Reasons for Instability:**
- The instability of H₂O₂ is primarily due to its tendency to break down into water (H₂O) and oxygen (O₂). This decomposition can be accelerated by light and certain catalysts.

...