欲除去甲烷气体中混有的乙烯得到纯净的甲烷，最好依次通过盛有试剂的装置．_刷题宝

题干

欲除去甲烷气体中混有的乙烯得到纯净的甲烷，最好依次通过盛有（）试剂的装置．

A：澄清石灰水、浓H₂SO₄

B：酸性KMnO₄溶液、浓H₂SO₄

C：溴水、浓H₂SO₄

D：CCl₄、碱石灰

上一题下一题 0.0难度选择题更新时间:2019-11-22 01:11:32

答案(点此获取答案解析）

C

同类题1

Tom always can't sleep well at night. But he was never late for work. He went to see his doctor on Sunday afternoon. He took the subway to get there. He met his boss on the subway and they talked for a while.

Tom got some sleeping pills from the doctor. That night Tom took the pills. He had a nice sleep. He went to work happily on foot in the morning. Getting into the office, he said to his boss “I had a nice sleep and got up happily this morning.” “That's fine,” shouted the boss, “but where were you on Monday?”

同类题2

已知f（x）=

{\begin{matrix} 2^{x - 1} (x \geq 1) \\ 3 x - 2 (x < 1) \end{matrix}

，若对任意θ∈0，

\frac{π}{2}

，不等式f（cos²θ+λsinθ﹣

\frac{1}{3}

\frac{1}{2}

＞0恒成立，整数λ的最小值为____．

同类题3

小火车开起来了

声____ ____ ____

民____ ____ ____

同类题4

在图甲的电路中，电源电压为9V且保持不变，电流表的量程为0～3A，电压表的理量程为0～15V，灯泡上标有“6V 6W”字样，灯泡电流随电压变化关系如图乙所示．求：

同类题5

下列实验操作正确的是（）

小学学科试题库

初中学科试题库

高中学科试题库