Which is a stronger reducing agent `Cr^(2+) or Fe^(2+)` and why?

Explanation

`Cr^(2+)` is stronger reducing agent than `Fe^(2+)` because in case of chromium the configuration changes from `d^(4) " to" d^(3).d^(3)` is stable in aqueous medium due to half filled `t_(2_(g))` orbitals while in case of Fe, the configuration changes from `d^(6)` to `d^(5)`. As the stability of `d^(3)` is more than `d^(5)` in aqueous medium, `Cr^(2+)` is a good reducing agent.