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In which of the following coordination entities the magnitude of $\Delta \mathrm{O}$ (CFSE in octahedral field) will be maximum (at. no. $\mathrm{Co}=27$ )?

ChemistryCoordination CompoundsNEETNEET 2008 (Mains)

Options:

A $\left[\mathrm{Co}\left(\mathrm{C}_2 \mathrm{O}_4\right)_3\right]^{3-}$
B $\left[\mathrm{Co}\left(\mathrm{H}_2 \mathrm{O}\right)_6\right]^{3+}$
C $\left[\mathrm{Co}\left(\mathrm{NH}_3\right)_6\right]^{3+}$
D $\left[\mathrm{Co}(\mathrm{CN})_6\right]^{3-}$

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