挑战习题
1/5单选题
难度:

1.

某溶液中可能含有Na+、NH4+、Ba2+、SO42、I、S2。分别取样:①用pH计测试,溶液显弱酸性②加氯水和淀粉无明显现象。为确定该溶液的组成,还需检验的离子是(    )


A

Na+

B

SO42-

C

Ba 2+

D

NH4+

提示1:
PHA+5rq25ray5pi+5byx6YW45oCn77yM6K+05piO5pyJTkg8c3ViPjQ8L3N1Yj48c3VwPis8L3N1cD7vvIjmsLTop6PmmL7phbjmgKfvvInvvJs8L3A+
提示2:
PHA+6YW45oCn5p2h5Lu25LiLUzxzdXA+Mjwvc3VwPjxzdXA+77yNPC9zdXA+5Lya5ZKMSDxzdXA+Kzwvc3VwPue7k+WQiOaIkEg8c3ViPjI8L3N1Yj5T5rCU5L2T77yM5omA5Lul5rq25ray5Lit5pegUzxzdXA+Mjwvc3VwPjxzdXA+77yNPC9zdXA+77ybPC9wPg==
提示3:
PHA+5Yqg5rCv5rC05ZKM5reA57KJ5peg5piO5pi+546w6LGh5o6S6ZmkSTxzdXA+77yNPC9zdXA+77yb5qC55o2u55S16I235a6I5oGS5Y6f55CG77yM5rq25ray5Lit6Zi056a75a2Q5Y+q6IO95pivU088c3ViPjQ8L3N1Yj48c3VwPjItPC9zdXA+77yM5pWF5LiN6IO95pyJQmEgPHN1cD4yKzwvc3VwPuOAguS9huaYr05hPHN1cD4rPC9zdXA+5peg5rOV5o6S6Zmk44CCPC9wPg==
正确答案:QQ==
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