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An Intiative by Sri Chaitanya
a
Reaction of gold with aqua regia produces NO2 in the absence of air
b
Reaction of gold with aqua regia produces an anion having Au in +3 oxidation state
c
Aqua Regia is prepared by mixing conc. HCl and conc. HNO3 in 3 : 1 (v/v) ratio
d
The yellow colour of aqua regia is due to the presence of NOCl and Cl2
answer is B.
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