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The complex that has highest crystal field splitting energy ( Δ ), is :

1. K 3 [Co(CN) 6 ]
2. K 2 [CoCl 4 ]
3. [Co(NH 3 ) 5 Cl] Cl 2
4. [Co(NH 3 ) 5 (H 2 O)Cl 3 ]

Correct answer: K 3 [Co(CN) 6 ]

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