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The calculated spin-only magnetic moments (BM) of the anionic and cationic species of [Fe(H 2 O) 6 ] 2 and [Fe(CN) 6 ], respectively, are

1. 2.84 and 5.92
2. 0 amd 5.92
3. 0 and 4.9
4. 4.9 and 0

Correct answer: 4.9 and 0

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