With reference to aqua regia , choose the correct option(s).
With reference to aqua regia, choose the correct option(s).
Reaction of gold with aqua regia produces in the absence of air
Aqua regia is prepared by mixing conc. and conc. in ratio
Reaction of gold with aqua regia produces an anion having in oxidation state
The yellow colour of is due to the presence of and
Solution
Aqua regia is 3 parts \(\mathrm{HCl}\) and 1 part \(\mathrm{HNO}_3\)
\(\begin{aligned}
& 3 \mathrm{HCl}+\mathrm{HNO}_2 \rightarrow \underset{\text { (Yellow colour is due to } \mathrm{NOCl} \text { and } \mathrm{Cl}_2 \text {) }}{\mathrm{NOCl}+\mathrm{Cl}_2+2 \mathrm{H}_2 \mathrm{O}} \\
& \mathrm{Au}+\text { Aqua Regia } \rightarrow \underset{(+30 . S \text { of Au})}{[\mathrm{AuCl}_4]^-}
\end{aligned}\)
\(\mathrm{Au}+4 \mathrm{H}^{+}+\mathrm{NO}_3^{-} 4 \mathrm{Cl}^{-} \rightarrow\left[\mathrm{AuCl}_4\right]^{-}+\mathrm{NO}+2 \mathrm{H}_2\)