下列有关说法错误的是
A．用洗洁精洗去油污，是利用乳化作用
B．CO和CO2组成元素相同，化学性质相同
C．使用无磷洗衣粉有利于保护水资源
D．可用pH试纸检验溶液的酸碱性
答案：B
题目分析：CO和CO2组成元素相同，但是组成这两种物质的分子不同，所以化学性质不同。
点评：中考中常在选择题和填空题中考察化学常识，每年必有，同学们应注意在平时的学习中多多积累总结。
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