Find the oxidation number of Cl in $C a (C l O_{2})_{2}$ .

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Solution

Let X be the oxidation number of Cl in $C a (C l O_{2})_{2}$ .
The O atoms have oxidation number of -2.
The Ca atoms have oxidation number of+2.
$+ 2 + 2 (X + 2 (- 2)) = 0$
$+ 2 + 2 (X - 4) = 0$
$+ 2 + 2 X - 8 = 0$
$2 X - 6 = 0$
$2 X = 6$
$X = + 3$
The oxidation number of Cl in $C a (C l O_{2})_{2}$ is $+ 3$ .

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