检验氯乙烷中氯元素存在的正确操作是                  A.

检验氯乙烷中氯元素存在的正确操作是        

         A.在氯乙烷中直接加入AgNO3溶液 

         B.在氯乙烷中加蒸馏水,然后加入AgNO3溶液     

         C.在氯乙烷中加入NaOH溶液,加热后酸化,然后加入AgNO3溶液         

         D.在氯乙烷中加入乙醇,加热后酸化,然后加入AgNO3溶液

答案

C

相关题目

阅读下面的词,完成第7-8题(4分)如梦令李清照昨夜雨疏风
阅读下面的词,完成第7-8题(4分)如梦令李清照昨夜雨疏风骤,浓睡不消残酒。试问卷帘人,却道“海棠依旧”。“知否?知否?应是绿肥红瘦。”【
The boss____________ the worker how to do it, or the accident couldn't have happ
The boss____________ the worker how to do it, or the accident couldn't have happened. A. can't have told              B. ought to tell C. could have told              D. must
阿诺德·汤恩比说,历史学家将他们最旺盛的精力都用在了文
阿诺德·汤恩比说,历史学家将他们最旺盛的精力都用在了文集和期刊组装材料的工作上,当他们试图把这些材料加工成“成品”或“半成品”时,再次
下列各句中,语意明确的一句是A.本次展览征集了近千幅家庭
下列各句中,语意明确的一句是A.本次展览征集了近千幅家庭老照片,这些照片是家庭生活的瞬间定格,却无不刻有时代的痕迹,让人过目难忘。B.运动
(1)计算: ;  (2)解分式方程: . 
(1)计算: ;  (2)解分式方程: . 
 I bought a new  sweater last weekend. It ________ me 120 yuan.   A. paid 
 I bought a new  sweater last weekend. It ________ me 120 yuan.   A. paid           B. take           C. cost             D. spent
—A new study proves(证明) a        walk every day is enough to keep p
—A new study proves(证明) a        walk every day is enough to keep people away from fat.A.30-minuteB.30 minute’sC.30-minutesD.30 minutes’s
_______ of time and energy has been spent in making the earthquake-stricken area
_______ of time and energy has been spent in making the earthquake-stricken areas a permanent museum to remind people how disastrous a natural disaster can be.    A. Large quantities   B. A great

最新题目