Question

Aqua regia is a mixture of

• A. 3 parts of concentrated $HCl$ and 2 part of concentrated $HN{O}_3$
• B. 2 parts of concentrated $HCl$ and 1 part of concentrated $HN{O}_3$
• C. 3 parts of concentrated $HCl$ and 1 part of concentrated $HN{O}_3$
• D. 3 parts of concentrated $H_{2}S{O}_4$ and 2 part of concentrated $HN{O}_3$

Answer 1

The correct option is C 3 parts of concentrated $HCl$ and 1 part of concentrated $HN{O}_3$

Aqua regia is a mixture of 3 parts of concentrated HCl and 1 part of concentrated $HN{O}_3$, which is used to dissolve noble metals like gold, platinum etc
$Au+4H^{+}+N{O}_3^{-}+4C{l}^{-}\to AuC{l}_4^{-}+NO+2H_{2}O$