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Among the ligands water, ammonia, cyanide, and oxalate, which one causes the greatest crystal field splitting, resulting in the highest value of Δ0 in [Co(CN)6]3−?

1. Water
2. Ammonia
3. Cyanide
4. Oxalate

Correct answer: Cyanide

Solution

Cyanide (CN−) is a strong field ligand according to the spectrochemical series, causing maximum crystal field splitting (Δ0) compared to water, ammonia, and oxalate.

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