（安徽泗县一中2008-2009学年第一学期高三第二次考试，化学，15）由于易被氧化而不宜长期存放的是：①KMnO4溶液 ②H2S溶液 ③FeSO4溶液 ④Cu(NO3)2溶液 ⑤Na2SO3溶液
A．只有②③⑤
B．只有①②
C．只有②④
D．只有①⑤
答案：A
H2S、FeSO4、Na2SO3分别易被空气中的氧气氧化成S、Fe2(SO4)3、Na2SO4。
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