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In KO2, the nature of oxygen species and the oxidation state of oxygen atom are, respectively:

1. Superoxide and −1
2. Superoxide and −1/2
3. Peroxide and −1/2
4. Oxide and −2

Correct answer: Superoxide and −1/2

Solution

In KO2, the oxygen exists as superoxide, which is characterized by the presence of an O2- ion with a charge of -1/2 per oxygen atom. This unique oxidation state arises because the superoxide ion contains a single unpaired electron, leading to its distinct properties.

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