For the reduction of $\mathrm{NO}_{3}{ }^{-}$ion in an aqueous solution, $E^{\circ}$ is +0.96 V . Va

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For the reduction of $\mathrm{NO}_{3}{ }^{-}$ion in an aqueous solution, $E^{\circ}$ is +0.96 V . Values of $E^{\circ}$ for some metal ions are given below\ $\mathrm{V}_{	ext {(ai) })}^{2+}+2 e^{-} ightarrow \mathrm{V} \quad ; \quad E^{\circ}=-1.19 \mathrm{~V}$\ $\mathrm{Fe}_{(a q)}^{3+}+3 e^{-} ightarrow \mathrm{Fe} \quad ; \quad E^{\circ}=-0.04 \mathrm{~V}$\ $\mathrm{Au}_{(	ext {aq) }}^{3+}+3 e^{-} ightarrow \mathrm{Au} ; E^{\circ}=+1.40 \mathrm{~V}$\ $\mathrm{Hg}_{(	ext {aq })}^{2+}+2 e^{-} ightarrow \mathrm{Hg} ; E^{\circ}=+0.86 \mathrm{~V}$\ The pair(s) of metals that is(are) oxidised by $\mathrm{NO}_{3}^{-}$in aqueous solution is(are)\

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(a, b, d)\