Which of the following pairs involves isoelectronic ions

Options

A. `Mn^(3+) and Fe^(2+)`
B. `Mn^(2+) and Fe^(3+)`
C. `Cr^(3+) and Fe^(2+)`
D. `Fe^(2+) and Co^(2+)`

Answer

B

Explanation

Among the given choice `Mn^(2+)` and `Fe^(3+)` involve isoelectronic ions.