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Which of the following complex is octahedral, diamagnetic and the most stable?

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

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

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