您所在的当前位置：高中化学试题 >

离子共存

> 某未知溶液中已检验出含有离子Ca 2+、NO 3 -，且pH=2．欲检验此溶液中是否大量存在以下6种离子：①ClO - ②NH 4 +③Fe 3+④I -⑤AlO 2 -⑥Cl -，其中不必检验就能加以否定的离子是（　　） A．③⑤⑥ B．①④⑤ C．①③④ D．④⑤⑥

问题：

发布时间：2024-09-11

某未知溶液中已检验出含有离子Ca ²⁺、NO ₃ ^-，且pH=2．欲检验此溶液中是否大量存在以下6种离子：①ClO ^- ②NH ₄ ⁺③Fe ³⁺④I ^-⑤AlO ₂ ^-⑥Cl ^-，其中不必检验就能加以否定的离子是（　　）

A．③⑤⑥ B．①④⑤ C．①③④ D．④⑤⑥

参考答案：

提问用户：bI***fMt

可能感兴趣的题目：

1 已知，是平面内两个互相垂直的单位向量，若向量满足，则的最大值是( ) A．1 B．2 C． D．
2 下列关于液氯、新制氯水叙述中不正确的是（　　） A．都具有酸性 B．都能使湿润的有色布条褪色 C．都含Cl2　　　 D．液氯是纯净物，而新制氯水是混合物
3 完形填空。 I devote myself to music because of my grandmother. My mom and I lived with grandparents from the time I was two until I was eight. And even then, I was at their house before and after school every day while my mother was 1 . Grandma loved music. It was she that first 2 me to Elvis Presley as a very young child, and once I heard his music, I was truly in 3 with it. Most five-year-olds ask for 4 for birthdays, but I wanted Elvis" albums. I would play them non-stop and 5 to the music in my grandma"s family room though my movements didn"t look 6 . Grandma played the piano and 7 me to sing "America the Beautiful" and "Somewhere over the Rainbow". I 8 started playing music on the piano, and soon Grandma was paying for me to take piano lessons from a lady living in the 9 . I would come home from 10 and walk there for my lesson. I 11 took about nine months of lessons, but it was enough to give me a(n) 12 and allow me to continue to teach myself. Last month when I came home to visit Grandma in the hospital, I brought along my guitar with me. She was 13 , but the music seemed to 14 her soul. She had me sing some songs and when I started to sing "Somewhere over the Rainbow", her weakened voice 15 in with mine for a few lines. That experience was one of the most 16 of my lifetime and one I will certainly cherish forever. I told her of my music career and she was very 17 and said, "That"s wonderful!" I 18 . to play for her throughout the week I was home. My grandma 19 two days ago. In my opinion, part of her will live on through every 20 I write or sing in my life. ( )1. A. at home ( )2. A. sent ( )3. A. debate ( )4. A. music ( )5. A. wave ( )6. A. funny ( )7. A. forced ( )8. A. generally ( )9. A. hotel ( )10. A. school ( )11. A. exactly ( )12. A. explanation ( )13. A. in deep sorrow ( )14. A. comfort ( )15. A. joined ( )16. A. genuine ( )17. A. energetic ( )18. A. refused ( )19. A. passed away ( )20. A. song B. at school B. left B. love B. benefit B. sleep B. balanced B. prepared B. finally B. apartment B. hospital B. only B. celebration B. in great pain B. spot B. poured B. impressive B. calm B. expected B. died away B. poem C. at work C. remembered C. agreement C. gifts C. dance C. good C. enabled C. fortunately C. neighborhood C. street C. completely C. translation C. in high spirits C. attract C. mixed C. puzzling C. exhausted C. continued C. passed by C. article D. in hospital D. introduced D. doubt D. toys D. play D. interesting D. taught D. suddenly D. hospital D. office D. seldom D. foundation D. in big trouble D. terrify D. combined D. unbelievable D. pleased D. pretended D. died out D. composition
4 ________ did the book Guide to China cost you? A.How many B.How much C.How long D.How often
5 某程序框图如图所示，该程序运行后输出的最后一个数是（　　） A．2 B．1.5 C．1.25 D．1.125
6 如图所示，水平传送带以5m/s的速度沿顺时针方向运动，在传送带上的P点轻轻地放上一质量m＝1 kg的小物块，PA间的距离为1.5m，小物块随传送带运动到A点后水平抛出，恰好沿圆弧切线从B点进入竖直光滑圆弧轨道运动。B、C为圆弧的两端点其连线水平，CD为与C点相切的一固定斜面。小物块离开C点后经0.8 s通过D点。已知小物块与传送带间的动摩擦因数μ 1＝0.3，圆弧轨道最低点为O，A点与水平面的高度差h＝0.8 m，小物块与斜面间的动摩擦因数μ 2＝，sin 37°=0.6，cos 37°=0.8， g取10 m/s 2。试求： (1)小物块离开A点时的速度大小； (2)圆弧BOC对应的圆心角θ为多少？ (3)斜面上CD间的距离。
7 读下面水分含量对玉米叶子反射率的影响图，回答问题。（6分） (1)据图可知，玉米叶子水分含量与反射率的关系是________(正或负相关)，要监测玉米缺水的状况，首要采用的现代化技术是________。2分 A．全球定位系统(GPS) B．地理信息系统(GIS) C．遥感(RS) D．决策支持系统(DSS) (2)监测玉米含水量变化，主要是通过监测玉米的________来判断玉米的生长状况 1分 A．电磁波特征 B．种植密度 C．种植面积 D．形状特征 (3)玉米反射率较高的波段为(　　 )1分 A．0.9um-1.2um B．1.5um-1.9um C．2.1um-2.3um D．0.5um-0.7um (4)依据上述原理，举例说明遥感在现代农业中的应用。2分
8 (2013·天津，11)It was not until near the end of the letter________she mentioned her own plan. A．that B．where C．why D．when
9 玻璃杯从同一高度落下，掉在水泥地面上比掉在草地上容易碎，这是由于玻璃杯与水泥地撞击过程中（） A．玻璃杯的动量较大 B．玻璃杯受的冲量较大 C．玻璃杯的动量变化较大 D．玻璃杯的动量变化较快
10 设角θ的终边经过点（3，-4），则 cos(θ+ π 4 )的值等于（　　） A． 2 10 B．- 2 10 C． 7 2 10 D．- 7 2 10

某未知溶液中已检验出含有离子Ca 2+、NO 3 -，且pH=2．欲检验此溶液中是否大量存在以下6种离子：①ClO - ②NH 4 +③Fe 3+④I -⑤AlO 2 -⑥Cl -，其中不必检验就能加以否定的离子是（ ） A．③⑤⑥ B．①④⑤ C．①③④ D．④⑤⑥

可能感兴趣的题目：