In which of the following, oxygen shows fractional oxidation number?
Correct answer: C. KO2
- A. OF2
- B. Na2O2
- C. KO2
- D. Cl2O7
Explanation
In KO2 (potassium superoxide), oxygen shows a fractional oxidation number. The oxidation number of oxygen in most compounds is -2. However, in KO2, each oxygen atom has an oxidation number of -½, due to the presence of superoxide ion.
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