Chemistry - Coordination Chemistry Question with Solution | TestHub

As the oxidation state of metal increases the CFSE value increases hence$\mathrm{\Delta }\hspace{0.17em}\mathrm{of} {\left[\mathrm{Ti}{\left({\mathrm{H}}_2\mathrm{O}\right)}_6\right]}^{3+}>{\left[\mathrm{Ti}{\left({\mathrm{H}}_2\mathrm{O}\right)}_6\right]}^{2+}$

$\text{Δ}$increase from 3d to 4d Series. So, 

$\text{Δ}\propto$ CFSE (Crystal field stabilisation energy)

${\mathrm{\Delta } \mathrm{of} \left[\mathrm{Cr}{\left({\mathrm{H}}_2\mathrm{O}\right)}_6\right]}^{2+}<\mathrm{\Delta } of {\left[\mathrm{Mo}{\left({\mathrm{H}}_2\mathrm{O}\right)}_6\right]}^{2+}$

Because here $\text{Δ}$ depends on Z_eff & Z_eff of 4d series is more than 3d series