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Question

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

A
The yellow colour of aqua regia is due to the presence of NOCl and Cl2
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B
Aqua regia is prepared by mixing conc. HCl and conc. HNO3 in 3 : 1 (v/v) ratio
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C
Reaction of gold with aqua regia produces an anion having Au in +3 oxidation state
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D
Reaction of gold with aqua regia produces NO2 in the absence of air
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Solution

The correct option is C Reaction of gold with aqua regia produces an anion having Au in +3 oxidation state
a) Yellow colour of aqua regia is due to NOCl and Cl2
b) In aqua regia HCl and HNO3 are in 3 : 1 ratio.
c)Au+3HNO3+4HClHAuCl4+3NO2+3H2O
d) NO2 is produced in the presence of air

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