Question

The composition of Aqua Regia is
1. Conc.H₂SO₄ and Conc. HCl in the ratio of 1:3
2. Conc.HNO₃ and Conc. HCl in the ratio of 1:3
3. Conc.HNO₃ and Conc. HCl in the ratio of 3:1 
4. Conc.H₂SO₄ and Conc. HNO3 in the ratio of 3:1

Answer 1

Correct Answer - Option 2 : Conc.HNO₃ and Conc. HCl in the ratio of 1:3

The correct answer is Conc.HNO₃ and Conc. HCl in the ratio of 1:3.

• Aqua regia is a yellow-orange or sometimes red colour fuming liquid. 
• Aqua regia is a mixture of hydrochloric acid (HCl) and nitric acid (HNO3) at a ratio of 3:1.
• Aqua regia is made by combining one part concentrated nitric acid (HNO3 ) to three parts concentrated hydrochloric acid (HCl).
• It must be made fresh because it will decompose quickly.

• Uses:
  • ​It is used for the manufacture of chloroauric acid.
  • It can dissolve noble metals such as gold and platinum but not all metals.
  •  It is used as an electrolyte in the Wohlwill process to refine gold of the highest quality.