The wavelength of light absorbed for the following complexes are in the order:
$I: [Co(NH_3)_6]^{3+}; II: [Co(H_2O)_6]^{3+}; III: [Co(CN)_6]^{3-}; IV: [Co(NH_3)_5(H_2O)]^{3+}; V: [CoF_6]^{3-}$

Given below are two statements:
Statement $I$: Among $Zn$, $Mn$, $Sc$ and $Cu$, the energy required to remove the third valence electron is highest for $Zn$ and lowest for $Sc$.
Statement $II$: The correct order of the following complexes in terms of $CFSE$ is $[Co(H_2O)_6]^{2+} < [Co(H_2O)_6]^{3+} < [Co(en)_3]^{3+}$.

Which of the following is correct related to the colours of $TiCl_3$ $(X)$ and $[Ti(H_2O)_6]Cl_3$ $(Y)$?

$[Fe(CN)_{6}]^{4-}$ and $[Fe(H_{2}O)_{6}]^{2+}$ are of different colours in dilute solutions. Why?

Select the correct order of $\Delta_o$ (Crystal Field Splitting Energy).

In the octahedral crystal field,the correct order of splitting for $I^{-}, H_2O, NH_3$ and $CN^{-}$ ligands is: