A) The yellow colour of aqua regia is due to the presence of \[NOCl\] and \[\text{C}{{\text{l}}_{2}}\]
B) Reaction of gold with aqua regia produces an anion having Au in +3 oxidation state
C) Reaction of gold with aqua regia produces \[\text{N}{{\text{O}}_{2}}\] the absence of air
D) Aqua regia is prepared by mixing cone.\[HCl\]and cone. \[\text{HN}{{\text{O}}_{3}}\]in \[3:1\] (v/v) ratio
Correct Answer: A , B , D
Solution :
(i) \[3HCl+HN{{O}_{3}}\to NoCl+2{{H}_{2}}O+2Cl\] \[Cl+Cl\to C{{l}_{2}}\] (ii) \[\text{Au}+3\text{Cl}\to \text{AuC}{{\text{l}}_{3}}\] \[\text{AuC}{{\text{l}}_{3}}+\text{HCl}+\to \text{HAuC}{{\text{l}}_{4}}\]Solution :
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