题目

Garbage often has negative associations with germs (细菌)，dirt and useless junk. However, a recent art exhibition proved that “useless” things can have practical significance.Dear Pretty Rubbish, an art event organized by the World Wide Fund for Nature (WWFN) and digital media art company Blackbow, was held in Beijing. It looked at wasteful consumption (消耗) and asked questions about the relationship between our lifestyles and our garbage.“We hope that everyone who visited the show can think about how ‘useless things’ are produced, why they are tossed out (扔走), and whether在25℃时，下列有关电解质溶液的说法不正确的是( )A.pH相等的四种溶液：a．CH3COONa b．Na2CO3 c．NaHCO3 d．NaOH，则四种溶液的溶质的物质的量浓度由小到大顺序为：d < b < c < aB.0.1mol·L－1的NaHCO3溶液：c(Na＋) ＞ c(HCO3－) ＞ c(CO32－)＞ c(H2CO3)C.1 L 0.50 mol·L－1NH4Cl 溶液与2 L 0.25 mol·L－1NH4Cl 溶液，前者含NH4+ 物质的量多D.浓度均为0.1mol·L－1的CH3COOH、CH3COONa混合溶液中：c(CH3COO－)＋c(OH－) ＞ c(CH3COOH)＋c(H+)