The d- electron configurations of `Mn^(2+),Fe^(2+),Co^(3+)` and `Ni^(2+)` ard `3d^(5),3d^(6),3d^(6),3d^(8)` , respectively
Which of the following aqua complexes will exhibit the minimum paramagnetic behviour ? .

Options

A. (a) `[Fe(H_2O)_6]^(2+)`
B. (b) `[Ni(H_2O)_6]^(2+)`
C. (c) `[Cr(H_2O)_6]^(2+)`
D. (d) `[Mn(H_2O)_6]^(2+)`

Answer

B

Explanation

`Cr^(2+), Mn^(2+), Fe^(2+)` and `Ni^(2+)` have 4, 5, 4 and 2 unpaired electrons respectively.