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  • Explain why [Fe(H2O)6]3+ has a magnetic moment value of 5.92 BM whereas [Fe(CN)6]3– has a value of only 1.74 BM.

Explain why [Fe(H_{2}{O})_{6}]^{3+} has a magnetic moment value of 5.92 BM whereas [Fe(CN)_{6}]^{3-} has a value of only 1.74 BM.

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The weak field ligand, H_{2}O in [Fe(H_{2}{O})_{6}]^{3+}, won’t cause pairing of electrons. And therefore, there will be 5 unpaired electrons.

CN^{-} is a very strong field ligand which can easily cause the pairing of all the electrons. And Fe^{3+} in [Fe(CN)_{6}]^{3-} has six unpaired electrons, so the electrons will start pairing, leaving one unpaired electron behind.

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infoexpert23

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