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In $$\text{KO}_2$$, the nature of oxygen species and oxidation state of oxygen atom are respectively
$$\text{KO}_2$$ contains the superoxide ion $$\text{O}_2^-$$. With K at $$+1$$, $$1 + 2x = 0$$, so each oxygen atom has oxidation state $$-\frac{1}{2}$$.
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