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The spin only magnetic moment of `[FeBr_(4)]^(-)` is 5.92 BM. Predict the geometry of complex ion.

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The spin only magnetic moment of `[FeBr_(4)]^(-)` is 5.92 BM. Predict the geometry of complex ion.
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Secondary valency of `Fe^(+3)` ion is 4. So, complex can be square planar `(dsp^(2))` or tetrahedral `(sp^(3))`. The magnetic moment indicates the presence of five unpaired electrons. Hence complex is tetrahedral (`sp^(3)`- hybridization).
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