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6.在溶液中加入适量 Na_2O_2后仍能大量共存的离子组是 ( )(A)NH_4~+、Ba~(2+)、Cl~-、NO_3~-(B)K~+、AlO_2~-、CI~-、SO_4~(2-)(C)Ca~(2+)、Mg~(2+)、NO_3~-、HCO_3~-(D)Na~+、Cl~-、CO_3~(2-)、SO_3~(2-)分析选(B).因 Na_2O_2加入到溶液中存在两种情况变化,一是因产生了 NaOH 加强了溶液的碱性,其次是 Na_2O_2有强氧化性,可氧化 SO_3~(2+)等,所以只有(B)选项符合.(A)选项中 NH_4~+离子分解放出
6. The ion groups that can still coexist in large quantities after adding appropriate amount of Na 2 O 2 in solution are () NH 4 +, Ba 2 +, Cl 3, NO 3 - (B) K +, AlO 2 - , CI~-, SO_4~(2-)(C)Ca~(2+), Mg~(2+), NO_3~-, HCO_3~-(D)Na~+, Cl~-, CO_3~(2) -), SO_3~(2-) analysis and selection (B). There are two kinds of changes due to the addition of Na2O2 to the solution. One is that NaOH enhances the alkalinity of the solution, and the second is Na2O2 has strong oxidizability and can be oxidized. SO_3~(2+), etc., so only the (B) option meets. (A) The option releases NH_4~+ ions