【判断题】【消耗次数:1】
硝酸银标准溶液需保存在棕色瓶中
正确
错误
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相关题目
【判断题】 硝酸银标准溶液应装在棕色碱式滴定管中进行滴定
①  正确
②  错误
【单选题】 硝酸银受热或者光照时容易分解,因此硝酸银应该保存在()。
①  锥形瓶
②  棕色瓶
③  容量瓶
④  广口瓶
【单选题】 向硝酸银溶液中滴入铬酸钾,会得到()。
①  砖红色沉淀
②  淡黄色溶液
③  红棕色沉淀
④  棕黄色溶液
【判断题】 药物中氯化物杂质检查的原理是:利用酸性溶液中杂质与硝酸银试液生成氯化银浑浊。所用的酸是硝酸
①  正确
②  错误
【单选题】 硫酸盐检查中加入的标准溶液是
①  硝酸银标准溶液
②  硫酸钡标准溶液
③  硫酸钾标准溶液
④  氯化钠标准溶液
⑤  硫酸钠标准溶液
【判断题】 鉴别1-氯丁烷,2-氯丁烷,2-甲基-2-氯丙烷可以直接用硝酸银的乙醇溶液!
①  正确
②  错误
【单选题】 检验 <img class="kfformula" src="20200628/1593355607797673.png" data-latex="{I}^{-}" width="38" height="30"/>先加入稀硝酸,再加入硝酸银溶液,则观察到的现象( )。
①  无沉淀
②  黄色沉淀
③  淡黄色沉淀
④  白色沉淀
【单选题】 检验 <img class="kfformula" src="20200628/1593355463567429.png" data-latex="{C1}^{-}" width="51" height="30"/>先加入稀硝酸,再加入硝酸银溶液,则观察到的现象( )。
①  白色沉淀
②  淡黄色沉淀
③  无沉淀
④  黄色沉淀
【单选题】 下列药物中,哪一个药物加氨制硝酸银能产生银镜反应
①  地西泮
②  阿司匹林
③  莘巴比妥
④  苯佐卡因????
⑤  以上均不对
【判断题】 异烟肼加水溶解后,加氨制硝酸银试液,即有黑色浑浊出现。此反应称银镜反应。
①  正确
②  错误
随机题目
【单选题】 Beowulf, the oldest great long poem ever written in English, is composed in a form of____.
①  epics
②  lyrics
③  folk songs
④  sagas
【单选题】 What meaning is referred to if we say the meaning of “dog” is friendship and loyalty?
①  denotative meaning
②  connotative meaning
③  literal meaning
④  labeled meaning.
【单选题】 What does it mean to know a word?
①  know its pronunciation and stress
②  know its spelling and grammatical properties
③  know its meaning and know when and how to use it
④  all of the above.
【单选题】 Which of the following statement is not true about vocabulary?
①  a vocabulary item can be more than one word
②  Vocabulary can not be taught. It must be learned by the individuals
③  Words are best learned in context
④  An English-English dictionary is an important aid for students.
【单选题】 What meaning is referred to if we say the meaning of “dog” is an animal with four legs and a tail, often kept as a pet or trained for work?
①  denotative meaning
②  connotative meaning
③  extended meaning
④  inspired meaning.
【单选题】 What do the following examples indicate? Big, huge; enormous, immense; male, masculine .
①  synonyms
②  antonyms
③  hyponyms
④  collocations.
【单选题】 What is referred to if we say “see a movie, watch a play, look at a picture”?
①  denotative meaning
②  connotative meaning
③  collocations
④  synonyms.
【单选题】 What are two categories of vocabulary?
①  Receptive vocabulary and productive vocabulary
②  innate vocabulary and learned vocabulary
③  familiar vocabulary and unfamiliar vocabulary
④  new vocabulary and old vocabulary.
【单选题】 What are two grammar practice activities?
①  Mechanical practice and meaningful practice
②  Volume practice and communicative practice
③  Interest practice and meaningful practice
④  Mechanical practice and success oriented practice.
【单选题】 What are two broad categories of knowledge?
①  Implicit knowledge and explicit knowledge
②  Obvious knowledge and unobvious knowledge
③  Inductive knowledge and deductive knowledge
④  Refereed knowledge and inferred knowledge.