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[单选题]
溴酸钾法测定苯酚的反应是如下:Br03-+5Br-+6H﹢=3Br2﹢3H2O,C6H5OH+3Br2==C6H5Br30H+3HBr,Br2+2I-=I2+2Br-,I2+2S2O6==S4O62-+2I-,在此测定中,Na2S203与苯酚的物质的量之比为()
A.6∶1
B.3∶1
C.2∶1
D.1∶1
![](https://lstatic.shangxueba.com/sxbzda/h5/images/tips_org.png)
A.6∶1
B.3∶1
C.2∶1
D.1∶1
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