In conversion of Cl2 to ClO3
--the oxidation state of Chlorine changes from ------to ------.
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The oxidation state of chlorine in ClO3- is the sum of the oxidation number provided by the anions (-2 for each oxygen), less the balance charge on the compound (-1 for ClO3-). Thus, the chlorine oxidation state is -2x3 - (-1) = +5 (negative charges must equal positive charge).
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