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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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