Which one of the following is an outer orbital complex and exhibits paramagnetic behaviour ?

Options

A. `[Ni(NH_3)_6]^(2+)`
B. `[Zn(NH_3)_6)]^(2+)`
C. `[Cr(NH_3)_6]^(3+)`
D. `[Co(NH_3)_6]^(3+)`

Answer

A

Explanation

`[Ni(NH_3)_6]^(2+)`
`Ni^(2+) = 3d^8`, according to CFT `=t_(2g)^6 e_(g)^2` therefore hybridisation is `sp^3 d^2` and complex is paramagnetic .