【題目】下列哪一個(gè)反應(yīng)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(xiàng)，、SO2中硫元素的化合價(jià)由+4價(jià)升高為+6價(jià)，SO2被氧化；B項(xiàng)，SO2中硫元素的化合價(jià)由+4價(jià)降低為0價(jià)，SO2被還原；C項(xiàng)，元素化合價(jià)沒有變化，不是氧化還原反應(yīng)，SO2既未被氧化也未被還原；D項(xiàng)，元素化合價(jià)沒有變化，不是氧化還原反應(yīng)，SO2既未被氧化也未被還原。

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