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With reference to aqua regia, choose the correct option(s).
[JEE Advanced - 2019]
(A) Reaction of gold with aqua regia produces \( \mathrm{NO}_{2} \) in the absence of air
P (B) Aqua regia is prepared by mixing conc. \( \mathrm{HCl} \) and

W conc. \( \mathrm{HNO}_{3} \) in \( 3: 1(\mathrm{v} / \mathrm{v}) \) ratio
(C) Reaction of gold with aqua regia produces an anion having Au in \( +3 \) oxidation staie
(D) The yellow colour of aqua regia is due to the presence of \( \mathrm{NOCl} \) and \( \mathrm{Cl}_{2} \)
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