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Crystal Field Split in Octahedral Complexes

Which of the ...

Question

Which of the following complexes is diamagnetic?

A

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

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B

[C u (N H_{3})_{4}]^{2 +}

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C

[T i (H_{2} O)_{6}]^{3 +}

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D

[N i (e n)_{2}]^{2 +}

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Solution

The correct option is C $[F e (C N)_{6}]^{4 -}$
Electronic configuartion:
$F e^{2 +} - [A r] 3 d^{6}$
$C u^{2 +} - [A r] 3 d^{9}$
$T i^{3 +} - [A r] 3 d^{1}$
$N i^{2 +} - [A r] 3 d^{8}$
Since $C N^{-}$ is a strong field ligand, it will pair up the electrons in d orbital and hence $[F e (C N)_{6}]^{4 -}$ become diamagnetic.

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Similar questions

Q. How many in each of the following complexes obey the rule of

18

[C u (N H_{3})_{4}]^{2 +}, [C u (e n)_{3}]^{2 +}, [C u (C N)_{4}]^{3 -}

[F e (C N)_{6}]^{4 -}, [F e (C N)_{6}]^{3 -}, F e (C O)_{6}

[N i (N H_{3})_{6}]^{2 +}, [N i (C N)_{4}]^{2 -}, [N i (C O)_{4}]

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

[C o (N H_{3})_{6}]^{3 +}, [C o C l_{4}]^{2 -}

Q. Of the two ions

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

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

, the diamagnetic ion is ____.

Q. How many given complexes are diamagnetic out of following?
[AuCl

_{4}

^{-}

_{2}

_{6}

^{3 +}

_{4}

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.

Q. Which one is more stable in the following pairs of complexes? Give reasons.
i)

[C o (N O_{2})_{6}]^{4 -}

[C o (N O_{2})_{6}]^{3 -}

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

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

[C O (H_{2} O)_{6}]^{2 +}

[C O (N H_{3})_{6}]^{2 +}

Q. Among the following complexes, the diamagnetic complexes are:

(K) : K_{3} [F e (C N)_{6}]

(L) : [C o (N H_{3})_{6}] C l_{3}

(M) : N a_{3} [C o (o x a l a t e)_{3}]

(N) : [N i (H_{2} O)_{6}] C l_{2}

(O) : K_{2} [P t (C N)_{4}]

(P) : [Z n (H_{2} O)_{6}] (N O_{3})_{2}

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