MCQ
The octahedral diamagnetic low spin complex among the following is
  • A
    $\left[ NiCl _4\right]^{2-}$
  • B
    $\left[ CoCl _6\right]^{3-}$
  • C
    $\left[ CoF _6\right]^{3-}$
  • $\left[ Co \left( NH _3\right)_6\right]^{3+}$

Answer

Correct option: D.
$\left[ Co \left( NH _3\right)_6\right]^{3+}$
d
(1) Paramagnetic, High Spin and Tetrahedral

(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

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