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Question

In the complex K2Fe[Fe(CN)6]:

A
Both Fe atoms are in the same oxidation state
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B
Both Fe atoms are in different oxidation state
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C
The coordination number of iron is 4
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D
The complex is a high spin complex
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Solution

The correct option is A Both Fe atoms are in the same oxidation state
In the complex, K2Fe[Fe(CN)6]:
Let, the oxidation state of Fe be x
Therefore,
1×2+2x1×6=02+2x6=02x=4x=+2
So, both Fe atoms are in same oxidation state (+2).
Coordination number of iron is 6.
In complex, hybridisation of central atom is d2sp3 as CN is a strong field ligand. So, it is a low spin complex.

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