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

Explanation

`Cr^(2+)` is stronger reducing agent than `Fe^(2+)`, because `d^(4) + d^(3)` occurs in case of `Cr^(2+)` to `Cr^(3+)` but `d^(4)rarr d^(3)` occurs in case of `Fe^(2+)` to `Fe^(3+)`. In aqueous solution, d. is more stable as compared to `d^(5)`.