What is perhydrol? Give its composition and use.

Explanation

**Step-by-Step Solution:**

1. **Definition of Perhydrol**:
- Perhydrol is a trade name for hydrogen peroxide, specifically referring to a concentrated form of it.

2. **Composition of Perhydrol**:
- The composition of perhydrol is typically 30% hydrogen peroxide (H₂O₂). This means that in a solution labeled as perhydrol, 30% of the solution is made up of hydrogen peroxide.

...