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At equimolar concentration of Fe^(2+) an...

At equimolar concentration of `Fe^(2+)` and `Fe^(3+)`, what must `[Ag^(+)]` be so that the voltage of the galvanic cell made from the `(Ag^(+) | Ag)` and `(Fe^(3+)|Fe^(2+)` electrodes equals zero?
`Fe^(2+) + Ag^(+) rightarrow Fe^(3+) + Ag`
`E_(Ag^(+), Ag)^(@)`= 0.7991, `E_(Fe^(3+)//Fe^(2+))^(@) = 0.771`

A

0.34

B

0.44

C

0.47

D

0.61

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