A model mixed-valence precipitate forms by 3FeCl₂ + 2K₃[Fe(CN)₆] → Fe₃[Fe(CN)₆]₂ + 6KCl. For THIS formal bookkeeping model, retain Fe(II) at the three counter-metal sites and low-spin Fe(III) at the t

Question

A model mixed-valence precipitate forms by 3FeCl₂ + 2K₃[Fe(CN)₆] → Fe₃[Fe(CN)₆]₂ + 6KCl. For THIS formal bookkeeping model, retain Fe(II) at the three counter-metal sites and low-spin Fe(III) at the two cyanido centres; do not assume electron redistribution. Which statements are correct?

TestHub · Accepted Answer

The mean is (3×2+2×3)/5 = 12/5 = 2.4. A ferricyanide centre has EAN 26−3+12 = 35 and low-spin d⁵ with one unpaired electron, not zero. The given formal-site assumption is essential: this question does not equate formal labels to experimentally localised charges in a real solid.

Chemistry - Coordination Chemistry Question with Solution | TestHub

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