您所在的当前位置：高中化学试题 >

氯及其化合物

> 某一无色晶体要鉴定它是否含I -，下列操作必要的是(　　) A．晶体用蒸馏水溶解，用硝酸酸化，再加入AgNO3溶液观察有无沉淀生成 B．加入NaOH溶液并加热，检验产生气体的性质 C．晶体用蒸馏水溶解，用盐酸酸化，再加入BaCl2观察有无沉淀生成 D．晶体用蒸馏水溶解，加入淀粉溶液，看溶液有无颜色生成

问题：

发布时间：2024-09-08

某一无色晶体要鉴定它是否含I ^-，下列操作必要的是(　　)

A．晶体用蒸馏水溶解，用硝酸酸化，再加入AgNO₃溶液观察有无沉淀生成

B．加入NaOH溶液并加热，检验产生气体的性质

C．晶体用蒸馏水溶解，用盐酸酸化，再加入BaCl₂观察有无沉淀生成

D．晶体用蒸馏水溶解，加入淀粉溶液，看溶液有无颜色生成

参考答案：

提问用户：F2***0gv

可能感兴趣的题目：

1 在某城市的一条道路上，规定车辆行驶速度不得超过40km／h。在一次交通事故中，肇事车是一辆卡车，量得这辆卡车紧急刹车（车轮被抱死）时留下的刹车痕迹长为9m，已知该卡车紧急刹车时的加速度大小是8m／s 2。 (1）判断该车是否超速。 (2）求刹车时间。 (3）求刹车过程中的平均速度。
2 忽略空气阻力，抛出后的小球在空中运动轨迹如图所示，抛出后的小球由于 A.不受力，运动状态发生改变 B.不受力，运动状态不发生改变 C.受到重力作用，运动状态发生改变 D.受到推力作用，运动状态发生改变
3 阅读理解。 As a boy, there was nothing I liked better than Sunday afternoons at my grandfather"s farm in western Pennsylvania. Surrounded by miles of winding stone walls, the house and field provided endless hours of fun for a city kid like me. I was used to tidy living rooms that seemed to whisper, "Not to be touched!" I can still remember one afternoon when I was eight years old. Since my first visit to the farm, I had wanted more than anything to be allowed to climb the stone walls surrounding the houses. My parents would never approve. The walls were old; some stones were missing, others loose and falling. Still, I entered the living room, where the adults had gathered after Sunday dinner. "I, uh-I wanna climb the stone walls," I said. Everyone looked up. "Can I climb the stone walls? Immediately voices of disagreement went up from the women in the room." Heavens, no! You"ll hurt yourself!" I wasn"t too surprised; the response was just as I"d expected. But before I could leave the room, I was stopped by my grandfather"s loud voice. "Now hold on just a minute," I heard him say, "Let the boy climb the stone walls. He has to learn to do things for himself.""Go", he said to me, "come and see me when you get back." For the next two and a half hours I climbed those old walls and had the time of my life. Later I met with my grandfather to tell him about my adventures. I"ll never forget what he said. "Fred", he said, smiling, "You made this day a special day just by being yourself. Always remember, here"s only one person in this whole world like you, and I like you exactly as you are." Many years have passed since then, and today I host the television program Mister Rogers Neighborhood, seen by millions of children throughout America. There have been changes over the years, but one thing remains the same: my message to children at the end of almost every visit. "There"s only one person in this whole world like you," the kids can count on hearing me say, "and people can like you exactly as you are." 1. When the writer was a little child, he lived _________. A. in the city B. on the farm C. with his grandparents D. away from his parents 2. The writer enjoyed his visits to the farm because ___________. A. there were old women there B. it was an exciting place for him C. he liked his grandfather D. the living room there was clean 3. The underlined word "approve" in paragraph 2 means ____________. A. prove B. suppose C. allow D. mind 4. What did the writer learn from his grandfather and his own experience on the farm? A. To do things for others B. To do whatever he liked. C. To be proud of himself D. To be himself.
4 – I’ve read another book this week. – Well, maybe ____ is not how much you read but what you read that counts. A．this B．that C．there D．it
5 “After World War Ⅱ,many of the cities across western European countries_____ , ”our guide said. A．lied in ruin B．lay in ruins C．lay in ruin D．lying in ruins
6 下列各组离子在溶液中能大量共存，且加人过量NaOH溶液或过量稀盐酸均能得到澄清溶液的是 [ ] A．Al 3+、Na +、SO 4 2-、NO 3 - B．K +、Na +、SiO 3 2-、ClO - C．Fe 2+、K +、SO 4 2-、Cl - D．Ca 2+、Mg 2+、HCO 3 -、NO 3 -
7 在水平光滑的滑冰场上，有甲、乙两小孩分别坐在两块滑冰板上．甲连同其滑冰板的质量大于乙连同其滑冰板的质量，原来都处于静止状态．在甲猛推一下乙后，两人分别向相反方向滑动，则（　　） A．甲和乙受到的推力大小相等 B．甲受到的推力更大些 C．乙受到的推力更大些 D．乙受到的推力的作用时间更长些
8 函数 y=4sin( x 2 - π 6 )的最小正周期是（　　） A．2π B．π C．4π D． π 2
9 It was in 1990 ______ the medicine was tested on human patients. A．since B．that C．before D．when
10 实验室用浓盐酸与二氧化锰反应制取氯气，下列说法中正确的是（气体体积均在标准状况下测定） A．若提供0.4molHCl,MnO2不足量,则可制得氯气2.24L B．若提供0.4molHCl,MnO2过量,则可制得氯气2.24L C．若有0.4molHCl参与反应,MnO2不足量,则可制得氯气2.24L D．若有0.4molHCl被氧化,MnO2不足量,则可制得氯气2.24L