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

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

No worries! We‘ve got your back. Try BYJU‘S free classes today!

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

Right on! Give the BNAT exam to get a 100% scholarship for BYJUS courses

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

No worries! We‘ve got your back. Try BYJU‘S free classes today!

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

No worries! We‘ve got your back. Try BYJU‘S free classes today!

Open in App

Solution

The correct option is B $[C o (C N)_{6}]^{3 -}$
$C N^{-}$ is a strong field ligand which causes pairing in the inner d-orbitals.

(a) $[C r (C N)_{6}]^{3 -} \Rightarrow C r^{3 +} : [A r] 3 d^{3}$

(b) $[C o (C N)_{6}]^{3 -} \Rightarrow C o^{3 +} : [A r] 3 d^{6}$

(c) $[F e (C N)_{6}]^{3 -} \Rightarrow F e^{3 +} : [A r] 3 d^{5}$

(d) $[M n (C N)_{6}]^{3 -} \Rightarrow M n^{3 +} : [A r] 3 d^{4}$

Greater the number of unpaired electrons, higher is the paramagnetism. Since $[C o (C N)_{6}]^{3 -}$ has no unpaired electrons, it will show diamagnetism.

Suggest Corrections

Similar questions

Q. On the basis of the spectro-chemical series, determine whether each of the following complexes is inner orbital or outer orbital and diamagnetic or paramagnetic.
(a)

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

(b)

[M n F_{6}]^{3 -}

(c)

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

(d)

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

Which one of the following cyano complexes would exhibit the lowest value of paramagnetic behaviour?

(Atomic Numbers: $C r = 24; M n = 25; F e = 26; C o = 27$ )

Atomic number of Mn. Fe and Co are 25, 26 and 27 respectively. Which of the following inner orbital octahedral complex ions are diamangetic?
(a) $[C o (N H_{3})_{6}]^{3 +}$
(b) $[M n (C N)_{6}]^{3 -}$
(c) $[F e (C N)_{6}]^{4 -}$
(d) $[F e (C N)_{6}]^{3 -}$

Q. Which of the following is diamagnetic?
(I)

K_{4} [F e (C N)_{6}]

(II)

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

(III)

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

(IV)

K_{2} [N i (C N)_{4}]

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

Join BYJU'S Learning Program