The oxidation state of iron in the given complex has to be calculated. Concept Introduction: Oxidation number calculation rules: For a free element the oxidation number is always 0 . For a monatomic ion the oxidation number equals to the charge of the ion. The oxidation number of hydrogen ( H ) is +1 , but it gets -1 oxidation when combined with less electronegative elements. In compounds, the oxidation number of oxygen ( O ) is usually -2 , but its oxidation number is -1 in peroxides. For Group 1 elements, the oxidation number in a compound is +1 . For Group 2 elements, the oxidation number in a compound is + 2 . For Group 17 elements, the oxidation number in a binary compound is - 1 . For a neutral compound the sum of the oxidation numbers of all of the atoms is 0 . In a polyatomic ion, the sum of the oxidation numbers is equal to the charge of the ion.

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Chapter 20.5, Problem 20.7P

Interpretation Introduction

Interpretation:

The oxidation state of iron in the given complex has to be calculated.

Concept Introduction:

Oxidation number calculation rules:

For a free element the oxidation number is always 0.

For a monatomic ion the oxidation number equals to the charge of the ion.

The oxidation number of hydrogen (H) is +1, but it gets -1 oxidation when combined with less electronegative elements.

In compounds, the oxidation number of oxygen (O) is usually -2, but its oxidation number is -1 in peroxides.

For Group 1 elements, the oxidation number in a compound is +1.

For Group 2 elements, the oxidation number in a compound is + 2.

For Group 17 elements, the oxidation number in a binary compound is - 1.

For a neutral compound the sum of the oxidation numbers of all of the atoms is 0.

In a polyatomic ion, the sum of the oxidation numbers is equal to the charge of the ion.

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