What is the magnetic moment of Fe3+ ion in [Fe(CN)6]3- ?

Question

What is the magnetic moment of Fe3+ ion in [Fe(CN)6]3- ? (A)  1.73 BM  (B)  5.9 BM  (C) Diamagnetic (D) None of these

Tardigrade Admin · Accepted Answer

Fe3+=[Ar] 3d5 (∵ CN- being a strong field ligand causes pairing) ∴ Magnetic moment, μ = √n(n+2) BM (where, n = number of unpaired electrons) =√1 (1+2) =√3 =1.73 BM

Q. What is the magnetic moment of $F e^{3 +}$ ion in $[F e (CN)_{6}]^{3 -}$ ?

$1.73 BM$

$5.9 BM$

$D iama g n e t i c$

None of these

$F e^{3 +} = [A r] 3 d^{5}$
$(∵ C N^{-}$ being a strong field ligand causes pairing)
$∴$ Magnetic moment, $μ = n (n + 2) BM$
(where, $n$ = number of unpaired electrons)
$= 1 (1 + 2) = 3$
$= 1.73 BM$

Q. What is the magnetic moment of Fe3+ ion in [Fe(CN)6​]3− ?

1.73BM

5.9BM

Diamagnetic