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

Question

Professor PC Thomas Classes · Answer

(b, c, d): $2 \mathrm{Au}+3 \mathrm{HNO}_{3}+11 \mathrm{HCl} ightarrow$ $$ 2 \mathrm{HAuCl}_{4}+3 \mathrm{NOCl}+6 \mathrm{H}_{2} \mathrm{O} $$ In $\mathrm{HAuCl}_{4}$ or $\left[\mathrm{AuCl}_{4}ight]^{-}, \mathrm{Au}$ is in +3 oxidation state.\