Which of the following statements is incorrect?
In K4 [Fe(CN)6], the ligand has satisfied both primary and secondary valencies of ferrous ion.
In [Cu(NH3)4]SO4, the ligand has satisfied only the secondary valency of copper.
In K3[Fe(CN)6] , the ligand has satisfied only the secondary valency of ferric ion.
In K3[Fe(CN)6], the ligand has satisfied both primary and secondary valencies of ferric ion