The composition of aqua-regia is
(A) Dil.HCl : Conc. HNO 3
3 : 1
(B) Conc.HCl : Dil. HNO 3
3 : 1
(C) Conc.HCl : Conc.HNO 3
3 : 1
(D) Dil.HCl : Dil.HNO 3
3 : 1
Answer
The composition of aqua regia is Conc.HCl : Conc.HNO 3
3 : 1
So, the correct answer is (c)