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Question:

For the reduction of NO3- ion in an aqueous solution, E0 is +0.96 V. Values of E0 for some metal ions are given below:
V2+(aq) + 2e- → V E0 = -1.19 V
Fe3+(aq) + 3e- → Fe E0 = -0.04 V
Au3+(aq) + 3e- → Au E0 = +1.40 V
Hg2+(aq) + 2e- → Hg E0 = +0.86 V
The pair(s) of metals that is(are) oxidized by NO3- in aqueous solution is(are):
VandHg
HgandFe
FeandAu
FeandV

VandHg

FeandV

HgandFe

FeandAu

Solution:

NO3- ion in an aqueous solution, E0 is +0.96 V. It can oxidize only those metals that have standard reduction potentials E0 less than NO3-. Thus, the metals V, Fe, and Hg can be oxidized by NO3- but not Au. Options A, B, and D are correct.