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