Which of the following complex is an outer orbital complex?

Options

A. (a) `[Ni(NH_3)_6]^(2+)`
B. (b) `[Mn(CN)_6]^(4-)`
C. (c) `[Co(NH_3)_6]^(3+)`
D. (d) `[Fe(CN)_6]^(4-)`

Answer

A

Explanation

`Ni` in `[Ni(NH_3)_6]^(2+)` has `sp^3d^2` (outer complex) having octahedral geometry.