In the redox equation O3 + H2O + SO2 → SO4^2- + O2 + 2H+, which species is oxidized?

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Multiple Choice

In the redox equation O3 + H2O + SO2 → SO4^2- + O2 + 2H+, which species is oxidized?

In redox processes, identify the species whose oxidation state increases—that one is oxidized. Here, sulfur in sulfur dioxide goes from +4 (in SO2) to +6 (in sulfate, SO4^2−). That clear increase shows sulfur has lost electrons and is oxidized. The other participants balance the electrons by the ozone being reduced to O2 in acidic conditions, while water and protons participate to balance atoms and charge. So the species being oxidized is the sulfur in sulfur dioxide.

In redox processes, identify the species whose oxidation state increases—that one is oxidized. Here, sulfur in sulfur dioxide goes from +4 (in SO2) to +6 (in sulfate, SO4^2−). That clear increase shows sulfur has lost electrons and is oxidized. The other participants balance the electrons by the ozone being reduced to O2 in acidic conditions, while water and protons participate to balance atoms and charge. So the species being oxidized is the sulfur in sulfur dioxide.

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