Question

Question 8
The composition of aqua-regia is
(a) ${\text{Dil.HCl: Conc.HNO}}_3$ - 3 : 1
(b) ${\text{Conc.HCl : Dil.HNO}}_3$ - 3 : 1
(c) ${\text{Conc.HCl : Conc.HNO}}_3$ - 3 : 1
(d) ${\text{Dil.HCl : Dil.HNO}}_3$ - 3 : 1

Answer 1

Option (c) is correct.

A mixture of concentrated ${\text{HNO}}_3$ and concentrated $\text{HCl}$ is called aqua regia which is also known as "royal water".
Aqua regia contains 1 part of concentrated ${\text{HNO}}_3$ by volume with 3 part of concentrated $\text{HCl}$ by volume.