下列离子方程式正确的是(    ) A.硫酸和氢氧化钡溶液反应:+H++OH-+B

下列离子方程式正确的是(    )

A.硫酸和氢氧化钡溶液反应:

+H++OH-+Ba2+BaSO4↓+H2O

B.硫化钠溶液中通入氯气:Cl2+S2-2Cl-+S↓

C.氢硫酸和氢氧化钠溶液反应:H++OH-H2O

D.碳酸钠溶液和氯化钡溶液反应:Ba2++

BaCO3

答案

解析:A应写为

+2H++2OH-+Ba2+BaSO4↓+2H2O

C应写为H2S+2OH-S2-+2H2O(因H2S是弱酸)

答案:BD


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