What is aqua-regia ? How it works to dissolve noble metals ?

Explanation

### Step-by-Step Text Solution:

**Step 1: Definition of Aqua Regia**
Aqua regia is a highly corrosive mixture of concentrated hydrochloric acid (HCl) and concentrated nitric acid (HNO3) in a molar ratio of 3:1. This unique combination allows it to dissolve noble metals, which are typically resistant to corrosion and oxidation.

**Step 2: Components of Aqua Regia**
When mixed, aqua regia produces several reactive species. The key components formed in the reaction include:
- Nitrosyl chloride (NOCl)
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