Find oxidation number of oxygen in $C a O_{2}$ .

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Solution

There is peroxide linkage in ${C a O}_{2}$
The oxidation number of $C a$ is $+ 2$
Let the oxidation number of $O$ be $x$
$∴ + 2 + 2 x = 0$
$∴ 2 x = - 2$
$∴ x = - 1$
Therefore, the oxidation number of $O$ in ${C a O}_{2}$ is $- 1$ .

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