Question
$[Fe(CN)_{6}]^{3-}$ is weakly paramagnetic while $[Fe(CN)_{6}]^{4-}$ is diamagnetic. Why?
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Answer
In $[ Fe ( CN ) 6]^{3-}$, Fe(III) has one unpaired electron, whereas in $\left[ Fe ( CN )_6\right]^{4-}$, Fe(II) has no unpaired electron.
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