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工业上常通过高温分解FeSO 4 的方法制备Fe 2 O 3 ，其化学方程式为： 2FeSO 4 ='===' Fe 2 O 3 +SO 2 ↑+SO 3 ↑ 为检验FeSO 4 高温分解的产物，进行如下实验： ①取少量FeSO 4 高温分解得到的固体，加一定量稀盐酸溶解，向该溶液中加入适量的KSCN溶液，观察溶液颜色的变化以检验Fe 3+ 是否存在。 ②将FeSO 4 高温分解产生的气体通入右图所示的装置中，以检验产生的气体中是否含有SO 2 和SO 3 。请回答以下问题： （1）写出用KSCN检验Fe 3+ 的离子方程式 。 （2）装置I中试剂为氯化钡溶液，进行操作②时氯化钡溶液中有白色沉淀产生。甲同学说，这个白色沉淀可能是BaSO 4 和BaSO 3 的混合物；说，这个白色沉淀是BaSO 4 ；丙同学说，这个白色沉淀是BaSO 3 。请你设计一个简单的实验帮他们加以鉴别。 你认为上述哪一位同学的观点正确？ （3）装置II中试剂为品红溶液，其作用是 ，品红溶液中可观察到现象是 。 （4）装置III中试剂为NaOH溶液，其目的是 。
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considerate
B.
considerable
C.
considering
D.
considered
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A.
friend
B.
friendship
C.
friendly
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frienless
【简答题】There are three things which are essential here.
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considerate
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considerable
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considering
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considered
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A.
who
B.
whose
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to which
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that
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