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Which of the following complex ion is not expected to absorb visible light?

1. [Ni(CN)₄]²⁻
2. [Cr(NH₃)₆]³⁺
3. [Fe(H₂O)₆]²⁺
4. [Ni(H₂O)₆]²⁺

Correct answer: [Ni(CN)₄]²⁻

Solution

The complex [Ni(CN)₄]²⁻ is square planar and involves strong field ligands (CN⁻), which cause a large crystal field splitting. This splitting pushes the d-d transitions into the UV region, making it unlikely to absorb visible light.

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