State anyone use of aqua regia.

Explanation

**Step-by-Step Solution:**

1. **Define Aqua Regia:**
Aqua regia is a highly corrosive mixture of two concentrated acids: hydrochloric acid (HCl) and nitric acid (HNO3). The typical ratio of these acids in aqua regia is 3 parts concentrated HCl to 1 part concentrated HNO3.

2. **Identify the Properties:**
Aqua regia is known for its ability to dissolve noble metals, which are typically resistant to corrosion and oxidation.

...