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What are the oxidation numbers in the compound H2O2?
The oxidation number of ##"H"## is +1. The oxidation number of ##"O"## is -1.
You assign to the in a compound by using the Rules for Oxidation Numbers.
The important rules for this problem are:
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The oxidation number of ##"H"## is +1, but it is -1 in when combined with less electronegative elements.
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The oxidation number of ##"O"## in is usually -2, but it is -1 in peroxides.
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The sum of the oxidation numbers of all the atoms in a neutral compound is 0.
The oxidation number of ##"H"## is +1 (Rule 1).
If you know that ##"H"_2"O"_2## is hydrogen peroxide, you can immediately assign oxygen the ON = -1.
If you don't know that ##"H"_2"O"_2## is hydrogen peroxide, you can use Rule 3.
The oxidation number of ##"H"## is +1. For two ##"H"## atoms, the sum is +2.
Since ##"H"_2"O"_2## has no charge, the total oxidation number of the two ##"O"## atoms must be -2.
The oxidation number of one oxygen atom must be -1.
