With reference to aqua regia, choose the correct option(s)

Options

A. Aqua regia is prepared by mixing conc. HCI and conc. `HNO_3` in 3:1 (V/V) ratio.
B. Reaction of gold with aqua regia produces an anion having Au in +3 oxidation state.
C. Reaction of gold with aqua regia produces `NO_2` in the absence of air.
D. The yellow color of aqua regia is due to the presence of NOCI and `Cl_2`.

Answer

A, B, D

Explanation

Option (A) : Correct `3HCl +HNO_(3) to NOCl+2H_(2)O+2Cl`
`Cl+Cl to Cl_(2)`
Option (B) : Correct `Au+3NO_(3)^(-) (aq) +6H^(+) (aq) Leftrightarrow Au^(3+) (aq)+3NO_(2)(g)+3H_(2)O (l)`
`Au^(3+) (aq)+4Cl^(-) (aq) Leftrightarrow AuCl_(4)^(-) (aq)`
Option (D) : Correct : The yellow color of aqua regia is mainly due to dissolved NOCl and `Cl_2`.