【題目】某水體中含有較多的泥沙及其他懸浮物，下列物質中不能用來凈化此水的是( )

A. KCl B. Fe2(SO4)3

C. KAl(SO4)2 D. FeCl3

【答案】A

【解析】Fe2(SO4)3、FeCl3可產(chǎn)生Fe(OH)3膠體，能用于凈水，KAl(SO4)2溶液可產(chǎn)生Al(OH)3膠體，也可用于凈水。

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