In water, the oxidation numbers of oxygen and hydrogen are:
AMinus 2 and plus 1
BMinus 1 and plus 2
CPlus 2 and minus 1
DPlus 1 and minus 2
Answer & Solution
Correct answer: A. Minus 2 and plus 1
1. Oxygen is the more electronegative atom.
2. Two hydrogens balance one oxygen.
3. So they are minus 2 and plus 1.
_Source: OpenStax Chemistry 2e, Chapter 17, Electrochemistry._
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