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Coordination Compounds — Chemistry STD 12 Science — Question

Gujarat BoardEnglish MediumSTD 12 ScienceChemistryCoordination Compounds1 Mark
Question
$\left[\mathrm{Fe}\left(\mathrm{H}_2 \mathrm{O}\right)_6\right]^{3+}$ is strongly paramagnetic whereas $\left[\mathrm{Fe}(\mathrm{CN})_6\right]^{3-}$ is weakly paramagnetic. Explain.
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Answer

In presence of $\mathrm{CN}^{-}$, (a strong ligand) the 3d electrons pair up leaving only one unpaired electron. The hybridisation is $\mathrm{d}^2 \mathrm{sp}^3$ forming inner orbital complex. In the presence of $\mathrm{H}_2 \mathrm{O}$, (a weak ligand), 3d electrons do not pair up. The hybridisation is $\mathrm{sp}^3 \mathrm{d}^2$ forming an outer orbital complex containing five unpaired electrons, thus greater the number of unpaired electrons more is the paramagnetic behavior.

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