Which one of the following cyano complexes would exhibit the highest value of magnetic moment ?

[C r (C N)_{6}]^{3 -}

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[M n (C N)_{6}]^{3 -}

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[F e (C N)_{6}]^{3 -}

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[C o (C N)_{6}]^{3 -}

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Solution

The correct option is A $[C r (C N)_{6}]^{3 -}$
$[C r (C N)_{6}]^{3 -}$ would exhibit the highest value of magnetic moment as it has maximum number of unpaired electrons. Higher is the number of unpaired electrons, higher is the magnetic moment.
Cations (with +3 charge) of Cr, Mn, Fe and Co contains 3,4,5 and 6 electrons in 3d subshell respectively. Cyanide ion is strong field ligand and favour spin pairing. Hence, cations (with +3 charge) of Cr, Mn, Fe and Co contains 3, 2, 1 and 0 unpaired electrons in 3d subshell respectively.

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Similar questions

Q. Which one of the following cyano complexes would exhibit the lowest value of paramagnetic behavior?

Using valence bond theory, explain the following in relation to the complexes given below
$[M n (C N)_{6}]^{3 -}, [C o (N H_{3})_{6}]^{3 +}, [C r (H_{2} O)_{6}]^{3 +}, [F e C l_{6}]^{4 -}$
(a) Type of hybridisation
(b) Inner or outer orbital
(c) Magnetic behaviour
(d) Spin only magnetic moment value.

Q. The magnetic moments of complexes given below are in the order:

(I)

[N i (C O)_{4}]

(II)

[M n (C N)_{6}]^{4 -}

(III)

[C r (N H_{3})_{6}]^{3 +}

(IV)

[C o F_{6}]^{3 -}

Q. Which one of the following cyano complex would exhibit diamagnetic behaviour?

Q. The hybridization and magnetic nature of

[M n (C N)_{6}]^{4 -}

and

[F e (C N)_{6}]^{3 -},

respectively are:

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