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Question

Which one of the following compounds is a peroxide?

A
NO2
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B
KO2
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C
BaO2
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D
MnO2
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Solution

The correct option is C BaO2

Peroxides are O22 ions. Ba has +2 oxidation state, so BaO2 is a peroxide.
KO2 is superoxide. Rest NO2 and MnO2 are also not peroxide.

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