(2) Paramagnetic, High Spin and Octahedral
(3) Paramagnetic, High Spin and Octahedral
(4) Diamagnetic, Low Spin and Octahedral
$\left[ Co \left( NH _3\right)_6\right]^{3+}, CN =6(\text { Octahedral })$
$NH _3= SFL$
$Co ^{+3}=[ Ar ] 3 d ^6$
Diamagnetic and Low spin complex