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【題目】下列哪一個反應表示二氧化硫被還原 ( )

A．SO2+2H2O+Cl2=H2SO4+2HCl B．SO2+2H2S=2H2O+3S

C．SO2+2NaOH=Na2SO3+H2O D．SO2+Na2CO3=Na2SO3+CO2↑

【答案】B

【解析】A項，、SO2中硫元素的化合價由+4價升高為+6價，SO2被氧化；B項，SO2中硫元素的化合價由+4價降低為0價，SO2被還原；C項，元素化合價沒有變化，不是氧化還原反應，SO2既未被氧化也未被還原；D項，元素化合價沒有變化，不是氧化還原反應，SO2既未被氧化也未被還原。

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