The oxidation number of Fe in [Fe(CN)6]3-, [Fe(CN)6]4-, [Fe(SCN)]2+ and [Fe(H2O)6]3+ respectively would be:

1
+3, +2, +3 and +3
2
+3, +3, +3 and +3
3
+2, +2, +2 and +2
4
+3, +2, +2 and +2
5
Not Attempted

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