Coordination Compounds Question 3
Question 3 - 2024 (01 Feb Shift 2)
$\left[Co\left(NH _3\right) _6\right]^{3+}$ and $\left[CoF _6\right]^{3-}$ are respectively known as:
(1) Spin free Complex, Spin paired Complex
(2) Spin paired Complex, Spin free Complex
(3) Outer orbital Complex, Inner orbital Complex
(4) Inner orbital Complex, Spin paired Complex
Show Answer
Answer (2)
Solution
$\left[Co\left(NH _3\right) _6\right]^{3+}$
$Co^{3+}$ (strong field ligand) $\Rightarrow 3 d^{6}\left(t _{2 g}^{6}, e _g^{0}\right)$,
Hybridisation : $d^{2} sp^{3}$
Inner obital complex(spin paired complex)
Pairing will take place.
$\left[CoF _6\right]^{3-}$
$Co^{3+}$ (weak field ligand) $\Rightarrow 3 d^{6}\left(t _{2 g}^{4}, e _g^{2}\right)$
Hybridisation : $sp^{3} d^{2}$
Outer orbital complex (spin free complex) no pairing will take place
