Some examples from this set of practice questions
1.
What is a the oxidation number of an element?
Answer: zero
2.
What is a the oxidation number of a monoatomic ion?
Answer: Same as the charge on the ion Example: oxidation number of Mg2+ is 2+
3.
What is the usual oxidation number of oxygen in a compound?
Answer: -2
4.
When is the oxidation number of oxygen -1?
Answer: When part of a peroxide Example: hydrogen peroxide H2O2
5.
When is the oxidation number of oxygen +2?
Answer: When bonded to fluorine in F2O
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