What is the oxidation number of Fe in K4Fe(CN)6?

The oxidation number or state of an atom/ion is the number of electrons an atom/ion that the molecule has either gained or lost compared to the neutral atom.

Oxidation number or oxidation state of an atom or ion in a molecule/ion is assigned by:

  • Summing up the constant oxidation state of other atoms/molecules/ions that are bonded to it and
  • Equating the total oxidation state of a molecule or ion to the total charge of the molecule or ion.

The oxidation number of Fe in K4Fe(CN)6 can be calculated as follows,

4(+1) + x + 6(-1) = 0

Hence, x = +2

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