The disproportionation of chlorate ions is represented by the balanced equation

CHEMISTRY · Single correct · A Level · Chemistry · Oxidation, reduction and redox reactions · Oxidation, reduction and redox reactions

Problem

The disproportionation of chlorate ions is represented by the balanced equation 2 ClO3−→2 Cl−+3 O22\,\text{ClO}_3^-\rightarrow 2\,\text{Cl}^-+3\,\text{O}_2. Which option correctly states how the oxidation number of chlorine changes and identifies whether chlorine is oxidized or reduced? (a) from +5+5 to +7+7; chlorine is oxidized (b) from +3+3 to −1-1; chlorine is reduced (c) from +5+5 to −1-1; chlorine is reduced (d) from +5+5 to −1-1; chlorine is oxidized

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