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Questions asked by users might not always be phrased in the clearest way.
The homoleptic complex is [Co(NH3)6]3+.
Here's why:
Homoleptic means a complex where all the ligands are the same. In this case, all ligands are ammonia (NH3).
[Co(NH3)4Cl2]+, [Ni(NH3)4Cl2], and [Fe(NH3)4Cl2]+ are heteroleptic complexes because they have both ammonia (NH3) and chloride (Cl-) ligands.