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In which of the following complexes the CFSE, Δ 0 will be equal to zero?

1. [Fe(NH 3 ) 6 ]Br 2
2. [Fe(en) 3 ]Cl 3
3. K 4 [Fe(CN) 6 ]
4. K 3 [Fe(SCN) 6 ]

Correct answer: K 3 [Fe(SCN) 6 ]

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