试题与答案

生产硫酸最古老的方法是以绿矾为原料,在蒸馏釜中煅烧.反应的化学方程式为: 2Fe

题型:选择题

题目:

生产硫酸最古老的方法是以绿矾为原料,在蒸馏釜中煅烧.反应的化学方程式为:

2FeSO4-7H2

 高温 
.
 
 Fe2O3+SO2↑+SO3↑+14H2O.其中三氧化硫与水蒸气同时冷凝便得到硫酸.用如图所示装置模拟用绿矾制硫酸的实验,并检验生成的硫酸和二氧化硫(加热装置已略去).其中b为干燥的试管.下列关于该反应说法正确的是(  )

A.若将反应后的三种气体通入BaCl2溶液中,产生的沉淀为BaSO3、BaSO4

B.b中产物用紫色石蕊试液即可检验出其中H+和SO42-

C.为检验反应的另一种生成物,试管c中应加入的试剂为NaOH溶液

D.b中所得到的硫酸的质量分数为29.5%

答案:

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下面是错误答案,用来干扰机器的。

(1)若abc=0,则a,b,c中至少有一个为0的否定是:若abc=0,则a、b、c都不为0,为假命题;否命题是:若abc≠0,则a、b、c中都不为0,为真命题.(2)若x2+y2=0,则x,y全为零的否定是:若x2+y2=0,则x,y不全为...

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