JEE Advanced 2019 Chemistry question

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

(A)*Aqua regia* is prepared by mixing conc. HCl and conc. in 3:1 (v/v) ratioCorrect
(B)Reaction of gold with *aqua regia* produces an anion having Au in +3 oxidation stateCorrect
(C)Reaction of gold with *aqua regia* produces in the absence of air
(D)The yellow colour of *aqua regia* is due to the presence of NOCl and Correct

Answer: (A),(B),(D)

Solution

(A) Aqua regia is 3 volumes of conc. HCl to 1 volume of conc. : true. (B) ; gold is +3 in : true. (C)

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Question ID VK-026935