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  4. The expected spin-only magnetic moments (BM) for [ Fe ( CN )6]4- and [ FeF 6]3- respectively are

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Q. The expected spin-only magnetic moments (BM) for $\left[ Fe ( CN )_6\right]^{4-}$ and $\left[ FeF _6\right]^{3-}$ respectively are

Chemical Bonding and Molecular Structure

Solution:

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$N$ (unpaired electrons) $=5$
Magnetic moment $=\sqrt{N(N+2)} BM$
$=\sqrt{35} BM =5.92\, BM$