Which cyano complex exhibits the minimum magn | vedclass

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(A) To determine the magnetic moment,we calculate the number of unpaired electrons $(n)$ in each complex. $CN^-$ is a strong field ligand,causing pair

Vedclass · Accepted Answer

$[Co(CN)_6]^{3-}$

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(A) To determine the magnetic moment,we calculate the number of unpaired electrons $(n)$ in each complex. $CN^-$ is a strong field ligand,causing pairing of electrons.(Atomic numbers: $Cr=24, Mn=25, Fe=26, Co=27$)ComplexElectronic Configuration of Metal IonUnpaired Electrons $(n)$Magnetic Moment $(\mu = \sqrt{n(n+2)} \ BM)$$[Co(CN)_6]^{3-}$$Co^{3+} (3d^6)$$0$$0 \ BM$$[Fe(CN)_6]^{3-}$$Fe^{3+} (3d^5)$$1$$\sqrt{3} \ BM \approx 1.73 \ BM$$[Mn(CN)_6]^{3-}$$Mn^{3+} (3d^4)$$2$$\sqrt{8} \ BM \approx 2.83 \ BM$$[Cr(CN)_6]^{3-}$$Cr^{3+} (3d^3)$$3$$\sqrt{15} \ BM \approx 3.87 \ BM$Since $[Co(CN)_6]^{3-}$ has $0$ unpaired electrons,it has the minimum magnetic moment of $0 \ BM$.

Which cyano complex exhibits the minimum magnetic moment?

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