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The oxidation number of oxygen in most compounds is:
AMinus two
BMinus one
CMinus four
DMinus five
Answer & Solution
Correct answer: A. Minus two
1. There are exceptions in peroxides.
2. Superoxides form the other exception.
3. In most compounds it is minus two.
_Source: NCERT Class 11 Chemistry, Unit 7 'Redox Reactions'_
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