Standard electrode potentials are
`Fe^(2+)//Fe, E^(@) = -0.44 V`
`Fe^(3+)//Fe^(2+), E^(@) = +0.77 V`
If `Fe^(3+), Fe^(2+)`, and Fe block are kept together, then

Options

A. `Fe^(3+)` increase
B. `Fe^(3+)` decrease
C. `(Fe^(2+))/(Fe^(3+))` remains unchanged
D. `Fe^(2+)` decrease

Answer

B

Explanation

(b) The metals have higher negative values of their electrode potential can displace metals having lower values from their salt solution. So , `Fe^(3+)` decreases