Q45 / 180 · KCET 2019 · Chemistry
In the reaction of gold with aquaregia, oxidation state of Nitrogen changes from
- Correct answerA\( +5 \) to \( +2 \)
- B\( +3 \) to \( +1 \)
- C\(+4 \) to \( +2 \)
- D\(+6 \) to \( +4 \)
Solution
(A)
\( \mathrm{Au}+4 \mathrm{H}^{+}+\mathrm{NO}_{3}^{+5}{ }^{-}+4 \mathrm{Cl}^{-} \rightarrow \mathrm{AuCl}{ }^{-}{ }^{-}+\mathrm{NO}^{+2} \mathrm{O}+2 \mathrm{H}_{2} \mathrm{O} \)
\( \mathrm{Au}+4 \mathrm{H}^{+}+\mathrm{NO}_{3}^{+5}{ }^{-}+4 \mathrm{Cl}^{-} \rightarrow \mathrm{AuCl}{ }^{-}{ }^{-}+\mathrm{NO}^{+2} \mathrm{O}+2 \mathrm{H}_{2} \mathrm{O} \)
Hence, the correct answer is option: 'A'.