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(B) For coordination complexes with a coordination number of $4$,the geometry can be either tetrahedral or square planar. Square planar complexes typi

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Measure the molecule's magnetic moment and use the result to estimate the number of unpaired spins in the molecule. If this number is low,the geometry is likely to be square planar; otherwise,it is likely to be tetrahedral

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(B) For coordination complexes with a coordination number of $4$,the geometry can be either tetrahedral or square planar. Square planar complexes typically exhibit low-spin configurations because the crystal field splitting energy is large enough to cause pairing. Tetrahedral complexes,due to smaller crystal field splitting,almost always exhibit high-spin configurations. Therefore,measuring the magnetic moment to determine the number of unpaired electrons helps distinguish between these two geometries.

$A$ chemist wants to determine the molecular geometry of the $[CoCl_4]^{2-}$ ion. Which of the following gives the best suggestion for a measurement and for the interpretation of that measurement?

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