2SO2 + O2 -> 2SO3
SO2 + MgO -> MgSO3
SO2 + CaO -> CaCO3
SO2 + 2NaOH = Na2SO3 + H2O
Ответ: б, в
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2SO2 + O2 -> 2SO3
SO2 + MgO -> MgSO3
SO2 + CaO -> CaCO3
SO2 + 2NaOH = Na2SO3 + H2O
Ответ: б, в