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  4. The calculated spin-only magnetic moments (BM) of the anionic and cationic species of [Fe(H2O)6]2 and [Fe(CN)6], respectively, are :

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Q. The calculated spin-only magnetic moments (BM) of the anionic and cationic species of $[Fe(H_2O)_6]_2$ and $[Fe(CN)_6]$, respectively, are :

JEE MainJEE Main 2019Coordination Compounds

Solution:

$\left[Fe\left(CN\right)_{6}\right]^{4-}\left[Fe\left(H_{2}O\right)_{6}\right]^{2+}$
$Fe^2+ \rightarrow 3d^6t^6_{2g}eg^0 Fe^2+ \rightarrow 3d^6t^4_{2g}eg^2$
$\mu=\sqrt{n\left(n+2\right)} \mu=\sqrt{n\left(n+2\right)}=\sqrt{24}=4.9BM$
$\mu=0$