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Question
Assign oxidation numbers to the underlined elements in the following species:
CaO2
Solution
CaO2
| +2 | x |
| Ca | O2 |
Then, we have
(+2) + 2(x) = 0
⇒ 2 + 2x = 0
⇒ x = -1
Hence, the oxidation number of O is - 1.
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