Question

The correct statement about the magnetic properties of $\left[Fe\right(CN{)}_6{]}^{3-}$ and $[Fe{F}_6{]}^{3-}$ is $(Z=26)$:

• A. Both are paramagnetic.
• B. Both are diamagnetic.
• C. $\left[Fe\right(CN{)}_6{]}^{3-}$ is diamagnetic, $[Fe{F}_6{]}^{3-}$ is paramagnetic.
• D. $\left[Fe\right(CN{)}_6{]}^{3-}$ is paramagnetic, $[Fe{F}_6{]}^{3-}$ is diamagnetic.

Answer 1

The correct option is A Both are paramagnetic.

The oxidation number of Fe in $\left[Fe\right(CN{)}_6{]}^{3-}$ and $[Fe{F}_6{]}^{3-}$ is +3. The electronic configuration of $F{e}^{3+}$ is $\left[Ar\right]3d^5$. Since it has 5 unpaired electrons in $[Fe{F}_6{]}^{3-}$ and 1 unpaired in $\left[Fe\right(CN{)}_6{]}^{3-}$, so, both are paramagnetic in nature.