(3分)下列用品的有效成分及用途对应错误的是( )
A B C D
用品 食盐 小苏打 明矾 漂白粉
有效成分 NaCl Na2CO3 KAl(SO4)
2•12H2O
Ca(ClO)2
用途 做调味品 做发酵粉 净水剂 做消毒剂
2012 北京卷 化学
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