What is the oxidation number of oxygen and hydrogen in 2h2o2?
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The oxidation number of oxygen in compounds is usually -2, but it is -1 in peroxides. 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 H₂O₂ is hydrogen peroxide, you can immediately assign oxygen the ON = -1.
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