Essential Chemistry for IGCSE - Chemical Reactions (Section 5 - No. 36)
What will be the oxidation state of an element in a compound containing only that element and oxygen?
Always -2.
Always +2.
Variable, depending on the other element.
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Explanation
The oxidation state will vary depending on the other element in the compound because oxygen's oxidation state is -2, so the other element has to take on a corresponding positive oxidation state to make the compound neutral.
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