[题目]下列哪一个反应表示二氧化硫被还原 ( )A．SO2+2H2O+Cl2=H2SO4+2HCl B．SO2+2H2S=2H2O+3SC．SO2+2NaOH=Na2SO3+H2O D．SO2+Na2CO3=Na2SO3+CO2↑ 题目和参考答案——青夏教育精英家教网—

【题目】下列哪一个反应表示二氧化硫被还原 ( )

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项，、SO2中硫元素的化合价由+4价升高为+6价，SO2被氧化；B项，SO2中硫元素的化合价由+4价降低为0价，SO2被还原；C项，元素化合价没有变化，不是氧化还原反应，SO2既未被氧化也未被还原；D项，元素化合价没有变化，不是氧化还原反应，SO2既未被氧化也未被还原。

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