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Question:

As per IUPAC nomenclature, the name of the complex [Co(H2O)4(NH3)2]Cl3 is:

Tetraaquadiamminecobalt (II) chloride

Tetraaquadiamminecobalt (III) chloride

Diamminetetraaquacobalt (II) chloride

Diamminetetraaquacobalt (III) chloride

Solution:

The IUPAC name of the complex given is Diamminetetraaquacobalt (III) chloride. The charge on central Co atom is +3. Hence, option (d) is correct.