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Which of the following complex ions is expected to absorb visible light?

1. [Ti(en)₂(NH₃)₂]⁴⁺
2. [Cr(NH₃)₆]³⁺
3. [Zn(NH₃)₄]²⁺
4. [Sc(H₂O)₃(NH₃)₃]³⁺

Correct answer: [Cr(NH₃)₆]³⁺

Solution

Cr³⁺ has a d³ configuration, which can absorb visible light due to the presence of unpaired electrons.

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