X、Y和W为原子序数依次递增的短周期元素,X和Y同主族,Y和W的气态

X、Y和W为原子序数依次递增的短周期元素,X和Y同主族,Y和W的气态氢化物具有相同的电子数,一般情况下X的单质只有氧化性。

(1)写出实验室制取W2反应的离子方程式                

(2)某小组设计如图所示的装置图(图中夹持和加热装置略去),分别研究YX2和W2的性质。

①分别通入YX2和W2,在装置A中观察到的现象是否相同(填“相同”或“不相同”)   ;若装置D中装的是铁粉,当通入W2时D中观察到的现象为   ;若装置D中装的是五氧化二钒,当通入YX2时,打开K通入适量X2,化学反应方程式为                  

②若装置B中装有5.0mL 1.0×103mol/L的碘水,当通入足量YX2完全反应后,转移了   mol电子,则该反应的化学方程式为               

(3)某同学将足量的YX2通入一支装有氯化钡溶液的试管,未见沉淀生成,向该试管中加入过量(填字母)        ,可以看到白色沉淀生成。

A.氨水  B.稀盐酸    C.稀硝酸  D.氯化钙

答案

(1) MnO24H2Cl===??Mn2Cl22H2O 。

(2) ①  相同     产生棕黄色的烟 2SO2O2V2O5△2SO3 ;

  5    SO2I22H2O===H2SO42HI  AC 


解析:

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