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एक जलीय विलयन में `NO_(3)^(-)` आयन के अपचयन (reduction) के लिए `E^(@)` का मान `+0.96V` है कुछ धातुओं के आयनो के `E^(@)` नीचे दिए गए है
`V^(2)(aq)+2e^(-)toV," "E^(@)=-1.19V`
`Fe^(3+)+2e^(-)toFe," "E^(@)=-0.04V`
`Au^(3+)(aq)+3e^(-)toAu," "E^(@)=+1.40V`
`Hg^(2+)(Aq)+2e^(-)toHg," "E^(@)=+0.86V`
जलीय विलयन में`NO_(3)^(-)` द्वारा ऑक्सीकृत (oxidized) हों वाले धातु युग्म है
A. V और Hg
B. Hg और Fe
C. Fe और Au
D. Fe और V

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V, Fe तथा Hg के अपचयन विभव `(E^(@))NO_(3)^(-)` के अपचयन विभव से कम है अतः ये `NO_(3)^(-)` द्वारा ऑक्सीकृत हो जायेगी ।

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