MCQ practice · SSC Chemistry Board questions · Chapter 7: Chemical Reactions
What is the oxidation number of oxygen in a peroxide compound?
Think it through first, then pick an option.
- a − 2
- b − 1
- c − ½
- d 0
Answer and explanation
Correct answer: b − 1
In peroxides such as H₂O₂, Na₂O₂, O = −1.
Why the other options are wrong
- a − 2: −2 is for ordinary oxides; in a peroxide it is −1.
- c − ½: −½ is for superoxides; peroxides are −1.
- d 0: 0 is for free O₂, not compounds.
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