For the octahedral complexes of Fe^{3+} in SC | vedclass

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(A) The electronic configuration of $Fe^{3+}$ is $[Ar] 3d^5$.Case-$1$: In the presence of $SCN^{-}$ (a weak field ligand),no pairing occurs in the $d$

Vedclass · Accepted Answer

$4$

Vedclass · Answer

(A) The electronic configuration of $Fe^{3+}$ is $[Ar] 3d^5$.Case-$1$: In the presence of $SCN^{-}$ (a weak field ligand),no pairing occurs in the $d$-orbitals. The number of unpaired electrons $(n)$ is $5$.$\mu = \sqrt{n(n+2)} = \sqrt{5(5+2)} = \sqrt{35} \approx 5.91 \ BM$.Case-$2$: In the presence of $CN^{-}$ (a strong field ligand),pairing occurs in the $d$-orbitals. The number of unpaired electrons $(n)$ is $1$.$\mu = \sqrt{n(n+2)} = \sqrt{1(1+2)} = \sqrt{3} \approx 1.73 \ BM$.Difference in spin-only magnetic moments $= 5.91 - 1.73 = 4.18 \ BM$.Rounding to the nearest integer,the difference is $4$.

List-$I$	List-$II$
$I. [FeF_6]^{3-}$	$A. 1.73 \ BM$
$II. [Ti(H_2O)_6]^{3+}$	$B. 5.93 \ BM$
$III. [Cr(NH_3)_6]^{3+}$	$C. 0.00 \ BM$
$IV. [Ni(H_2O)_6]^{2+}$	$D. 2.83 \ BM$
$V. [Fe(CN)_6]^{4-}$	$E. 3.88 \ BM$

For the octahedral complexes of $Fe^{3+}$ in $SCN^{-}$ (thiocyanato-$S$) and in $CN^{-}$ ligand environments,the difference between the spin-only magnetic moments in Bohr magnetons (when approximated to the nearest integer) is
[Atomic number of $Fe = 26$]

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Match List-$I$ with List-$II$ and select the correct answer using the codes given below:
List-$I$ List-$II$
$I. [FeF_6]^{3-}$ $A. 1.73 \ BM$
$II. [Ti(H_2O)_6]^{3+}$ $B. 5.93 \ BM$
$III. [Cr(NH_3)_6]^{3+}$ $C. 0.00 \ BM$
$IV. [Ni(H_2O)_6]^{2+}$ $D. 2.83 \ BM$
$V. [Fe(CN)_6]^{4-}$ $E. 3.88 \ BM$

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Total number of geometrical isomers possible for the complexes $[NiCl_4]^{2-}$,$[CoCl_2(NH_3)_4]^{+}$,$[Co(NH_3)_3(NO_2)_3]$ and $[Co(NH_3)_5Cl]^{2+}$ is

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For the octahedral complexes of $Fe^{3+}$ in $SCN^{-}$ (thiocyanato-$S$) and in $CN^{-}$ ligand environments,the difference between the spin-only magnetic moments in Bohr magnetons (when approximated to the nearest integer) is[Atomic number of $Fe = 26$]