The d electron congfiguration of `Cr^(2+)` , `Mn^(2+)` , `Fe^(2+)` and `Ni^(2+)` are `3d^(4)` , `3d^(5)` , `3d^(6)` and `3d^(8)`

The d electron congfiguration of `Cr^(2+)` , `Mn^(2+)` , `Fe^(2+)` and `Ni^(2+)` are `3d^(4)` , `3d^(5)` , `3d^(6)` and `3d^(8)` respectively. Which one of the folowing aqua complexes will exhibit the minimum paramagnetic behaviour ?
`(At. No . Cr = 24, Mn = 25, Fe = 26, Ni = 28)`
A. `|Cr(H_(2)O)_(6)|^(2+)`
B. `|Mn(H_(2)O)_(6)|^(2-)`
C. `|Fe(H_(2)O)_(6)|^(2+)`
D. `|Ni(H_(2)O)_(6)|^(2+)`

The d electron congfiguration of `Cr^(2+)` , `Mn^(2+)` , `Fe^(2+)` and `Ni^(2+)` are `3d^(4)` , `3d^(5)` , `3d^(6)` and `3d^(8)` respectively. Which o

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