In this case, we have the oxidation of mercury (\(\mathrm{Hg}\)) and the reduction of nitrate ions (\(\mathrm{NO}_{3}^{-}\)).
- Oxidation: \(\mathrm{Hg} \rightarrow \mathrm{Hg}^{2+}\)
- Reduction: \(\mathrm{NO}_{3}^{-} \rightarrow \mathrm{NO}_{2}\)
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