What is Aqua Regia?
1
A solution comprised of a 1 : 3 mixture of sulphuric acid and nitric acid, respectively
2
A solution comprised of a 3 : 1 mixture of hydrochloric acid and nitric acid, respectively
3
A solution comprised of a 3 : 1 mixture of sulphuric acid and nitric acid, respectively
4
A solution comprised of a 1 : 3 mixture of hydrochloric acid and nitric acid, respectively