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Question
What is effective atomic number of Fe (z = 26) in [Fe(CN)6]4-?
(a) 12
(b) 30
(c) 26
(d) 36
Solution
36
In ferrocyanide ion, [Fe(CN)6]4–
Here, Z = atomic number of iron = 26.
X = number of electrons lost due to oxidation of Fe to Fe2+ = 2.
Y = number of electrons donated by 6CN– = 6 x 2 = 12.
∴ EAN = 26 – 2 + 12 = 36
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