- A$0.015 M$ urea
- B$0.01\,M\,KN{O_3}$
- ✓$0.01\,M\,N{a_2}S{O_4}$
- D$0.015\,M\,$glucose
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$\overset{\left( II \right)}{\mathop{\left[ Cu{{\left( N{{H}_{3}} \right)}_{4}} \right]}}\,$ $\overset{\left( II \right)}{\mathop{\left[ PtC{{l}_{4}} \right]}}\,$
$\mathrm{V}^{2+}(\mathrm{aq})+2 \mathrm{e}^{-} \rightarrow \mathrm{V} \ \ \ \ \mathrm{E}^0=-1.19 \mathrm{~V} $
$\mathrm{Fe}^{3+}(\mathrm{aq})+3 \mathrm{e}^{-} \rightarrow \mathrm{Fe} \ \ \ \ \mathrm{E}^0=-0.04 \mathrm{~V} $
$\mathrm{Au}^{3+}(\mathrm{aq})+3 \mathrm{e}^{-} \rightarrow \mathrm{Au} \ \ \ \ \mathrm{E}^0=+1.40 \mathrm{~V} $
$\mathrm{Hg}^{2+}(\mathrm{aq})+2 \mathrm{e}^{-} \rightarrow \mathrm{Hg} \ \ \ \ \mathrm{E}^0=+0.86 \mathrm{~V}$
The pair$(s)$ of metals that is$(are)$ oxidized by $\mathrm{NO}_3^{-}$in aqueous solution is$(are)$
$(A)$ $\mathrm{V}$ and $\mathrm{Hg}$ $(B)$ $\mathrm{Hg}$ and $\mathrm{Fe}$
$(C)$ $\mathrm{Fe}$ and $\mathrm{Au}$ $(D)$ $Fe$ and $V$