Aqua regia is a mixture of

Options

A. equal volumes of conc. `HCl` and conc. `HNO_(3)`
B. one volume of conc. `HCl` and three volumes of conc. `HNO_(3)`.
C. Three volumes of conc. `HCl` and one volume of conc. `HNO_(3)`.
D. one volume of conc. `HCl` and two volumes of conc. `HNO_(3)`

Answer

C

Explanation

Aqua regia is a mixture of concentrated nitric and hrdrochloric acid (1 to 3 by volume ). A highly corrosive liquid that attacks and dissolves. Hg, Au (forming chloroauric acid, `HAuCl_(4)`), and Pt (forming chloroplatinic acid, `H_(2)[PtCl_(6)]`
It attacks many substances unaffected by other reagents. It turns orange yellow owing to the formation of nitrosyl chlorise `(NOCl)` and free chlorine.