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VBT Tetrahedral vs Square Planar

The [FeCN6]...

Question

The $[F e (C N)_{6}]^{3 -}$ complex ion:

exhibits planar geometry

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is diamagnetic

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should be very stable

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has 2 unpaired electrons

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Solution

The correct option is C should be very stable
In the given complex the oxidation state of iron is +3. The electronic configuration of iron in +3 oxidation state is $1 s^{2} 2 s^{2} p^{6} 3 s^{2} 3 p^{6} 3 d^{5}$ . The compound has 1 unpaired electrons and exhibit octahedral geometry. It is a low spin complex and is very stable.

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

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

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