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Q. The EAN value of iron in potassium ferricyanide is

NTA AbhyasNTA Abhyas 2020Coordination Compounds

Solution:

$K _{3}\left[ Fe ( CN )_{6}\right]$

$\text{Oxidation} \, \text{No} \text{.} \, \text{of} \, \text{Fe} \, \text{=} \, \text{+3}$

$\text{EAN} \, \text{=} \, \text{26} - \text{(+3)}$

$+ \, 2 \times 6$

$= 35$

EAN of a central metal ion = (atomic no. of central atom) - oxidation state $+$ no. of ligands $\times 2 \times$ denticity.