Question

Standard electrode potentials for $Fe $ electrode are given as
$Fe^{2+}+2e^{-} \rightarrow Fe ; E^{o}=-0.44\, V$
$Fe^{3+}+e^{-} \rightarrow Fe^{2+}; E^{o}=+0.77\, V$
$ Fe^{2+}, Fe^{3+}$ and $Fe$ blocks are kept together then

• A. $Fe ^{3+}$ decreases
• B. $Fe ^{3+}$ increases
• C. $\frac{ Fe ^{2+}}{ Fe ^{3+}}$ remains unchanged
• D. $Fe ^{2+}$ decreases

Answer 1

Answer: (A)

The metals have higher negative values of their electrode potential can displace metals having lower values from their salt solution. So, $Fe ^{3+}$ decreases.