Among the following pairs of complexes,in whi | vedclass

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(D) The crystal field splitting energy $\Delta_0$ depends on the nature of the ligand,the oxidation state of the metal,and the principal quantum numbe

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$[Rh(H_2O)_6]^{3+}$ and $[Co(H_2O)_6]^{3+}$

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(D) The crystal field splitting energy $\Delta_0$ depends on the nature of the ligand,the oxidation state of the metal,and the principal quantum number of the metal ion.For the pair $[Rh(H_2O)_6]^{3+}$ and $[Co(H_2O)_6]^{3+}$,both have the same ligand $(H_2O)$ and the same oxidation state $(+3)$.However,$Rh$ belongs to the $4d$ series while $Co$ belongs to the $3d$ series.As we move down a group,the size of the $d$-orbitals increases,leading to greater overlap with ligand orbitals and thus a larger $\Delta_0$ value.Therefore,$\Delta_0$ for $[Rh(H_2O)_6]^{3+} > \Delta_0$ for $[Co(H_2O)_6]^{3+}$.

Among the following pairs of complexes,in which case is the $\Delta_0$ value higher for the first one?

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