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With reference to aqua regia, choose the correct option(s)
Aqua regia is prepared by mixing conc. HCl and cone. $$HNO_3$$ in 3 : 1 (v/v) ratio
Reaction of gold with aqua regia produces an anion having Au in +3 oxidation state
Reaction of gold with aqua regia produces $$NO_2$$ in the absence of air
The yellow colour of agua regia is due to the presence of NOCl and $$Cl_2$$
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