Aqua Regia
Aqua regia is a mixture of concentrated HCl and HNO₃ in the ratio:
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About This Question
- Subject
- chemistry
- Chapter
- p-block elements
- Topic
- aqua regia
- Difficulty
- Easy
- Year
- 2025
Solution
Correct Answer:
3:1
Aqua Regia ('Royal Water') is a highly corrosive mixture used to dissolve noble metals like Gold (Au) and Platinum (Pt) that are resistant to single acids.
- Composition: It is a mixture of approximately 3 parts concentrated HCl and 1 part concentrated HNO3 by volume.
- Reaction: The combination produces nascent Chlorine and Nitrosyl Chloride (NOCl):
- 3HCl+HNO3→NOCl+Cl2+2H2O+[Cl]
- The nascent chlorine reacts with Gold to form soluble Chloroauric acid (HAuCl4).
This easy difficulty chemistry question is from the chapter p-block elements, covering the topic of aqua regia. It appeared in the 2025 exam.
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