Which of the following properties is /are same in 

I  ${\left[CrC{l}_6\right]}^{3-}$  II. ${\left[Cr{\left(H_{2}O\right)}_6\right]}^{3+}$    III. ${\left[Cr{\left(N{H}_3\right)}_6\right]}^{3+}$    IV. ${\left[Cr{\left(CN\right)}_6\right]}^{3-}$

In All complexes Cr in +3 oxidation state

$C{r}^{3+},d^3$configuration show same no of unpaired electron in strong  field or weaker field

But EAN of all complexes are same strength of all ligands are different so donot show same colour and splitting