1) SO2 + H2O = H2SO3
2) SO2 + 2KOH = K2SO3 + H2O
3) 2SO2 + O2 = 2SO3
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1) SO2 + H2O = H2SO3
2) SO2 + 2KOH = K2SO3 + H2O
3) 2SO2 + O2 = 2SO3