JEE Main 2024 — 1 February, Shift 2 — Question 73

$\left[\mathrm{Co}\left(\mathrm{NH}_{3}\right)_{6}\right]^{3+}$

$\mathrm{Co}^{3+}($ 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