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

Options

A. `[Cr(NH_(3))_(6)]^(3+)`
B. `[Co(NH_(3))_(6)]^(3+)`
C. `[Ni(NH_(3))_(6)]^(2+)`
D. `[Zn(NH_(3))_(6)]^(2+)`

Answer

C

Explanation

`Cr^(3+) and Co^(3+)` both are `d^(2)sp^(3)` hybridised and hence the corresponding complexes are inner orbital complexes. `[Zn(NH_(3))_(6)]^(2+)` is outer orbital complex but diamagnetic in nature. `[Ni(NH_(3))_(6)]^(2+)` is outer orbital complex but diamagnetic in nature. `[Ni(NH_(3))_(6)]^(2+)` is an inner orbital complex and paramagnetic in nature.