A) +2
B) + 4
C) +1
D) - 1
Correct Answer: C
Solution :
In oxidation state, group (I) metals (alkali metals) such as potassium always have oxidation state +1. The \[O_{2}^{-}\] ion is called a superoxide anion and its overall oxidation state is -1. Each oxygen atom contributes equally to overall oxidation state, so the oxidation state of each individual oxygen is - 0.5. The compound is called potassium superoxide.
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