Oxygen in most of its compounds is assigned an oxidation number of:
AMinus two
BMinus one
CMinus four
DMinus five
Answer & Solution
Correct answer: A. Minus two
1. Oxygen usually pulls electrons towards itself.
2. It normally gains a share of two of them.
3. So its oxidation number is minus two.
_Source: OpenStax Chemistry 2e, Chapter 4, Stoichiometry of Chemical Reactions._
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