Which of the following complex ions is expected to absorb visible light? (At. nos. Zn = 30, Sc = 21, Ti = 22, Cr = 24)

Question

Which of the following complex ions is expected to absorb visible light?
(At. nos. Zn = 30, Sc = 21, Ti = 22, Cr = 24)

[Ti(en)₂(NH₃)₂]⁴⁺

[Cr(NH₃)₆]³⁺

[Zn(NH₃)₆]²⁺

[Sc(H₂O)₃(NH₃)₃]³⁺

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