Arrange the following complexes in order of increasing crystal field splitting .
`[Fe(H_(2)O)_(6)]^(2+),[Fe(H_(2)O)_(6)]^(3+) , [FeCl_(6)]^(4-)` .

[Fe(H_(2)O)_(6)]^(2+) is

Arrange the following in order of decreasing number of unpaired electrons. : I:[Fe(H_(2)O)_(6)]^(2+) " " II:[Fe(CN)_(6)]^(3-)" " III:[Fe(CN)_(6)]^(4-) " " IV:[Fe(H_(2)O)_(6)]^(3+)

[Fe(H_(2)O)_(6)]^(2+) and [Fe(CN)_(6)]^(4-) differ in

[Fe(H_(2)O)_(6)]^(3+) and [Fe(CN)_(6)]^(3-) differ in

[Fe(H_(2)O)_(6)]^(3+) and [Fe(CN)_(6)]^(3-) differ in