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Why do compounds having similar geometry...

Why do compounds having similar geometry have different magnetic moment ?

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The difference is due to presence of weak and strong ligands. If ligand is strong (high CFSE), electrons in d-subshell will pair up and magnetic moment will be low. If ligand is weak (low CFSE), electrons will not pair up. Hence, magnetic moment will be high, e.g. `[CoF_(6)]^(3-) and [Co(NH_(3))_(6)]` both are octahedral but former is paramagnetic while latter is diamagnetic.
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