Question

With reference to aqua regia, choose the correct option(s)
A. Aqua regia is prepared by mixing conc. HCl and conc. `HNO_(3)` in 3:1 molar ratio
B. Rection of gold with aqua regia product an anion having Au in `+3` oxidation state.
C. Reaction of gold with aquaregia produces `NO_(2)` in the absence of air
D. The yellow colour of aqua regia is due to the presence of NOCl & `Cl_(2)`

Answer 1

Correct Answer - A::B::D
`Au+4H^(+)+NO_(3)^(-)+4Cl^(-)to[AuCl_(4)]^(Theta)+NO+2H_(2)O`
(A) fact
(B). `[AuCl_(4)]^(-)` gets formed `Au(+3)`
(C). NOCl/NO is formed
(D). Fact.