MCQ
$[Co(NH3)_6]^{3+}$ and $[CoF_6]^{3–}$ are respectively known as:
- ASpin free Complex, Spin paired Complex
- BSpin paired Complex, Spin free Complex
- COuter orbital Complex, Inner orbital Complex
- DInner orbital Complex, Spin paired Complex
✓
Answer
$\left[ Co \left( NH _3\right)_6\right]^{3+}$
$Co ^{3+}($ 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
$Co ^{3+}($ 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
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