The effective atomic number (EAN) for $[F e (C N)_{6}]^{3 -}$ ?

36

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35

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34

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37

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Solution

The correct option is B $35$
$F e^{3 +} = [A r] 3 d^{5} 4 s^{0}$
Hence the central metal atom, $F e^{3 +}$ has 23 electrons.
Electrons gained by coordination $= 2 \times 6 = 12$ electrons.
Therefore, $E A N = [23 \times + (6 \times 2) = 35]$

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