Question

The effective atomic number of Iron (Z = 26) in [Fe(CN)₆]^-3 is ______.

Options

• 36

• 33

• 35

• 34

Answer 1

The effective atomic number of Iron (Z = 26) in [Fe(CN)₆]^-3 is 35.

Explanation:

In the given complex ion [Fe(CN)₆]^-3, the Fe is in + 3 oxidation state. As we know that the atomic number of iron is 26. The number of electron in Fe³⁺ is 23. Each of the six cyanide molecules donates a pair of electrons so that EAN becomes 23 + 2 x 6 ⇒ 35.