Which complex follows Werner’s theory by having a primary valence satisfied by sulfate ions?

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[Ni(H₂O)6]SO₄ Correct [Co(NH₃)6]Cl₃ [Cr(en)3]Cl₃ [Fe(CN)6]4−

In [Ni(H₂O)6]SO₄, Ni is +2 (primary valence), balanced by SO₄ 2−.

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