Among the following pairs of complexes,in whi | vedclass

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(D) The crystal field splitting energy $\Delta_0$ depends on the oxidation state of the metal,the nature of the ligand,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 oxidation state of the metal,the nature of the ligand,and the principal quantum number of the metal ion $(3d In option $D$,both complexes have the same ligand $(H_2O)$ and the same oxidation state $(+3)$.However,$Rh$ is a $4d$ transition metal,while $Co$ is a $3d$ transition metal.Since $\Delta_0$ increases down a group due to the larger size and greater spatial extension of $d$-orbitals in $4d$ and $5d$ metals,the $\Delta_0$ value for $[Rh(H_2O)_6]^{3+}$ is significantly higher than that of $[Co(H_2O)_6]^{3+}$.

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

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