The oxidation number of oxygen in $K O_{3}, {N a}_{2} O_{2}$ is:

3, 2

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1, 0

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0, 1

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- 0.33, - 1

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Solution

The correct option is C $- 0.33, - 1$
$K O_{3}$
Suppose oxidation number of $O = x, \Rightarrow 1 + 3 x = 0$
$3 x = - 1$
$x = - \frac{1}{3} = - 0.33$
${N a}_{2} O_{2}$
Suppose oxidation number of $O = x$
$2 \times 1 + 2 x = 0$
$2 + 2 x = 0$
$2 x = - 2 \Rightarrow x = - \frac{2}{2}$
$x = - 1$

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