Question

The magnetic moment (B.M) of $\left[Fe\right(CN{)}_6{]}^{4-}$ & $\left[Fe\right(H_{2}O{)}_6{]}^{2+}$ respectively are:

• A. $\sqrt{24},zero$
• B. $\sqrt{24},\sqrt{24}$
• C. $zero,\sqrt{24}$
• D. $zero,zero$

Answer 1

Answer: (C)

$zero,\sqrt{24}$

$\left[Fe\right[CN{]}_6{]}^{4-}⟶F{e}^{2+}⟶3d^6$

Lowspin complex $⟶0$ unpaired $e^{-}$

$\mu =\sqrt{n(n+2)}\Rightarrow \sqrt{0(0+2)}=0$

$\left[Fe\right(H_{2}O{)}_6{]}^{2+}⟶4$ unpaired $e^{-}\Rightarrow \sqrt{4(4+2)}=\sqrt{24}$