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QUESTION

# 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:

1. The oxidation number of "H" is +1, but it is -1 in when combined with less electronegative elements.

2. The oxidation number of "O" in is usually -2, but it is -1 in peroxides.

3. 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.