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Which of the following complex is homoleptic?

1. [Co(NH 3 ) 4 Cl 2 ] +
2. [Ni(NH 3 ) 2 Cl 2 ]
3. [Fe(NH 3 ) 4 Cl 2 ] +
4. [Ni(CN) 4 ] 2–

Correct answer: [Ni(CN) 4 ] 2–

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