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JAMB - Chemistry (1979 - No. 26)

In which of the following reactions is sulphur dioxide acting as an oxidizing agent?
SO 2 + 2HNO3 →H2SO4 + NO2 + Heat
2SO2 + 2H2O + O2→ 2H2SO4
SO2 + 2H2O + CI2→ H2SO4 + 2HCI
SO2 + 2H2S → 3S + 2H2O
SO2 + H2O → H2SO3

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