Among the following complexes, the one which shows zero crystal field stabilization energy (CFSE) is

Options

A. `[Fe(H_(2)O)_(6)]^(3+)`
B. `[Co(H_(2)O)_(6)]^(2+)`
C. `[Co(H_(2)O)_(6)]^(3+)`
D. `[Mn(H_(2)O)_(6)]^(3+)`

Answer

A

Explanation

`Fe^(3+)(d^(5))` has `t_2g^(3)``e_(g)^(2)` configuration CFSE(`delta_0)` = `3 xx (-0.4) + (2+).6) `= 0