What is the oxidation number of copper in [Cu(NH3)4]SO4?
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Complex ion =[Cu(NH3)4]
The Cu ion is covalently bonded to the neutral molecule NH3.
Counterion = SO4
Charge on counterion= 2-
Hence charge on Complex ion=2+
The oxidation state of the central metal can be determined as follows: (metal ion oxidation state + ligand charges) = complex ion charge
Cu ion oxidation state + 0= 2+
Or Cu ion oxidation state=2+
Oxidation number of Copper= +2