题干

工业上用固体硫酸亚铁制取颜料铁红(Fe2O3),反应原理是:2FeSO4
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Fe2O3+SO2↑+SO3↑,某学生欲检验该反应所产生的气态物质,他依次将气体通过盛有(I)BaCl2溶液、(II)x 溶液、(III)NaOH 溶液的三个装置.则下列对该方案的评价中正确的是(  )

A:(I)中会生成 BaSO3、BaSO4两种沉淀

B:可将(I)中的 BaCl2溶液改为 Ba(NO32溶液

C:(III)的作用是检验生成的 SO2气体

D:(II)所盛 x 应为品红溶液

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答案(点此获取答案解析)

D

同类题3

通读下面短文, 掌握其大意, 然后在每小题所给的四个选项中, 选出一个最佳答案, 并将答题卡上对应的选项涂黑。

    My parents are busy with their work every day. You can't see there is love 1 them. They don't act in the romantic(浪漫的)2that I read in books or I see on TV.

    One day, while Mom was sewing(缝) a quilt,I 3 beside her. “Mom, I have a question,” I said after a while.

    “What?” she asked.

    “Is there love between you and Dad?” I asked her in a very low voice.

    She stopped sewing and 4 her head. Then she bowed her head and went on sewing.

    I thought I had hurt her. At last I heard my mother say, “Susan, look at this thread(线). Sometimes it appears, but most of it disappears in the quilt. It makes the quilt5. If life is a quilt, then love should be a thread. It can hardly be seen, but it's 6 there.”

    I couldn't understand her 7 the next spring. My father suddenly got sick. Mom had to stay with him in the hospital for a month.

    After they 8, my mother helped my father walk slowly down the country road every day. My father had never been so gentle.

    “Dad, how are you 9 now?” I asked him one day. “Susan, don't worry about me,” he said. “I just like walking with your Mom.”

     Once I thought 10 meant flowers, gifts and sweet kisses. But from this experience, I understand that it is just a thread in the quilt of our life . It is inside, making life strong and warm.