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

`[Ni(NH_(3))_(6)]^(2+)`
Weak ligand with two unpaired electron.