The oxidation number of Cl in $C a (C l O_{2})_{2}$ :

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Solution

The correct option is D 3
Its a ${(C l O_{2})}^{- 1}$ ion. For finding the oxidation number of Cl , the sum of Oxidation Numbers of Cl and O should be equal to -1

x + (-4) = -1
x = +3

So Oxidation of Cl is +3

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