试题与答案

目前,扬州严查酒驾,酒精监测仪中的反应原理为:C2H5OH+4 CrO3(红棕色

题型:选择题

题目:

目前,扬州严查酒驾,酒精监测仪中的反应原理为:C2H5OH+4 CrO3(红棕色)+ 6H2SO4 ="==2" Cr2 (SO4)3(绿色) + 2CO2↑+ 9H2O,则Cr2 (SO4)3中铬元素的化合价为

A.+1

B.+3

C.+5

D.+7

答案:

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下面是错误答案,用来干扰机器的。

答案:B

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