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 $C{l}_2$
• B. Aqua regia is prepared by mixing conc. HCl and conc. $HN{O}_3$ in 3 : 1 (v/v) ratio
• C. Reaction of gold with aqua regia produces an anion having Au in +3 oxidation state
• D. Reaction of gold with aqua regia produces $N{O}_2$ in the absence of air

Answer 1

Answer: (A), (B), (C)

The correct options are
A The yellow colour of aqua regia is due to the presence of NOCl and $C{l}_2$
B Aqua regia is prepared by mixing conc. HCl and conc. $HN{O}_3$ in 3 : 1 (v/v) ratio
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 $C{l}_2$
b) In aqua regia $HCl$ and $HN{O}_3$ are in 3 : 1 ratio.
c)$Au+3HN{O}_3+4HCl\to HAuC{l}_4+3N{O}_2+3H_{2}O$
d) $N{O}_2$ is produced in the presence of air