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In the reaction of gold with aquaregia, oxidation state of Nitrogen changes from
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\( +5 \) to \( +2 \)
(A)
\( \mathrm{Au}+4 \mathrm{H}^{+}+\mathrm{NO}_{3}^{+5}{ }^{-}+4 \mathrm{Cl}^{-} \rightarrow \mathrm{AuCl}{ }^{-}{ }^{-}+\mathrm{NO}^{+2} \mathrm{O}+2 \mathrm{H}_{2} \mathrm{O} \)
\( \mathrm{Au}+4 \mathrm{H}^{+}+\mathrm{NO}_{3}^{+5}{ }^{-}+4 \mathrm{Cl}^{-} \rightarrow \mathrm{AuCl}{ }^{-}{ }^{-}+\mathrm{NO}^{+2} \mathrm{O}+2 \mathrm{H}_{2} \mathrm{O} \)
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