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Crystal Field Split in Octahedral Complexes

Which of the ...

Question

Which of the following complex ion is low spin as well as paremagnetic?

A

[

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

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B

[

C o (C_{2} O_{4})_{3}]^{3 -}

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C

[

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

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D

[

N i (e n)_{3}]^{2 +}

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Solution

The correct option is D [ $F e (C N)_{6}]^{3 -}$
$F e^{3 +} \to d^{5} =$ strong field ligand $(C N) \to t 2 g^{5} e g^{0} \to n = 1$ (unpaired)
So, it is paramagnetic.

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Similar questions

Q. The correct order of the spin only magnetic moment of metal ions in the following low spin complexes,

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

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

[R u (N H_{3})_{6}]^{3 +}

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

The octahedral complex ions

[F e C l_{6}]^{3 -}

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

are both paramagnetic but the former is high spin and the latter is low spin. In the low spin complex,

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

has the d-configuration as :

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

is low spin complex but

[F e (H_{2} O)_{6}]^{+ 3}

is high spin complex. Explain.

Q. Which of the following complex is inner orbital as well as low spin complex ?

The octahedral complex ions

[F e C l_{6}]^{3 -}

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

are both paramagnetic but the former is high spin and the latter is low spin.
Thus, CFSE for the complexes,

[F e C l_{6}]^{3 -}

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

are ___________ .

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