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SAT II Chemistry Exam Prep

Category - Multiple Choice

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What is the oxidation number of oxygen in hydrogen peroxide, H₂O₂?

Image Credit: Wikimedia Commons

1
2
-3
-2
-1

Explanation

Answer: -1

In most compounds, oxygen has an oxidation number of -2. However, peroxides are an exception to this rule. For hydrogen peroxide, each of the hydrogens has an oxidation number of 1. Therefore, each of the oxygens must have an oxidation number of -1.

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