Answer: Na2O2Peroxides contain oxygen atoms with a -1 oxidation number. In the context of this question, Na2O2 is the only peroxide, and thus the only compound with an oxygen atom with a -1 oxidation number.

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SAT Chemistry

Category - Multiple Choice

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Which of the following compounds contains an oxygen atom with a -1 oxidation number?

H₂O
CO₂
Na₂O₂
Al₂O₃
MgO

Explanation

Answer: Na₂O₂

Peroxides contain oxygen atoms with a -1 oxidation number. In the context of this question, Na₂O₂ is the only peroxide, and thus the only compound with an oxygen atom with a -1 oxidation number.

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