Which complex has a secondary valence of 4 according to Werner’s theory?

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[Cu(NH₃)4]SO₄ Correct [Co(NH₃)6]Cl₃ [Fe(H₂O)6]2+ [Cr(en)3]3+

Secondary valence is the coordination number. [Cu(NH₃)4]SO₄ has 4 NH₃ ligands, giving a coordination number of 4.

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