2021 Inorganic chemistry experiment(Dalian University of Technology) 最新满分章节测试答案

本答案对应课程为:点我自动跳转查看
本课程起止时间为:2021-03-31到2021-07-26
本篇答案更新状态:已完结

Chapter 2. Purification of Sodium Chloride Quiz-Chapter 2. Purification of Sodium Chloride

1、 问题:In the experiment of purification of sodium chloride, in which step can potassium ion be removed？
选项：
A:Dissolution and filtration
B:Adding barium chloride solution
C:Adding sodium carbonate solution
D:Evaporation and crystallization
答案: 【Evaporation and crystallization】

2、 问题:In the experiment of purification of sodium chloride, the filtrate is transferred to an evaporating dish and evaporated until the solution is in what state?
选项：
A: Boiling starts
B:Crystal film appears
C:Be a thin paste
D:Evaporate to dryness
答案: 【Be a thin paste】

3、 问题:What color is the precipitate produced in the identification reaction of magnesium ion?
选项：
A:Blue
B: Green
C:Brown
D: Pink
答案: 【Blue】

4、 问题:In what medium should the identification of calcium ion be carried out？
选项：
A:Hydrochloric acid
B:Sodium hydroxide
C:Acetic acid
D:Deionized water
答案: 【Acetic acid】

5、 问题:In which medium should the identification of magnesium ion be carried out?
选项：
A:Alkaline
B: Acidic
C:Neutral 
D:All above
答案: 【Alkaline】

6、 问题:In the experiment of purification of sodium chloride, the filtrate was evaporated, concentrated and evaporated to dryness, and then the purified sodium chloride was obtained.
选项：
A:正确
B:错误
答案: 【错误】

7、 问题:When using the tray balance to weigh the reagents, the objects should be placed on the left and the weights should be placed on the right.
选项：
A:正确
B:错误
答案: 【正确】

8、 问题:In the experiment of purification of sodium chloride, 2 mol/L hydrochloric acid was used to adjust the pH of the solution to 6-7 before evaporation.
选项：
A:正确
B:错误
答案: 【错误】

9、 问题:In the experiment of purification of sodium chloride, when barium chloride is added into the solution, white precipitate is formed, which indicates the existence of sulfate ion in the solution.
选项：
A:正确
B:错误
答案: 【错误】

10、 问题:In the experiment of purification of sodium chloride, sulfate ions can be removed by non-toxic calcium chloride solution instead of barium chloride solution.
选项：
A:正确
B:错误
答案: 【错误】

Chapter 3. Purification of Copper Sulfate Quiz-Chapter 3. Purification of Copper Sulfate

1、 问题:When adding 6 mol/L ammonia to copper sulfate solution, the green precipitate appears first, then the precipitate dissolves and turns into blue solution. What is the green precipitate? 
选项：
A:Copper hydroxide
B:Copper dihydroxosulphate
C:Tetraammine copper (II) ion
D:Hexaammine copper (II) ion
答案: 【Copper dihydroxosulphate】

2、 问题:In the experiment of purification of copper sulfate, what pH value should be adjusted before the filtrate is evaporated and concentrated?
选项：
A:7
B:1-2
C:4
D:14
答案: 【1-2】

3、 问题:In the experiment of purification of copper sulfate, in order to remove iron and not reduce the yield of the product, what should be the pH value of the solution?
选项：
A:7
B:1-2
C: 4
D:14
答案: 【 4】

4、 问题:In the experiment of purification of copper sulfate, what solution should be used to adjust the pH of the solution？
选项：
A:Sodium hydroxide
B:Potassium hydroxide
C:Copper hydroxide
D:Copper dihydroxosulphate
答案: 【Sodium hydroxide】

5、 问题:In the copper sulfate purification experiment, if the solution in the evaporating dish turns green during evaporation, what is the reason? 
选项：
A:Copper ion hydrolyzes.
B:The temperature is too high.
C:The impurities are not removed completely.
D:The evaporation is too dry and the crystal water is lost.
答案: 【Copper ion hydrolyzes.】

6、 问题:In the experiment of purification of copper sulfate, the filtrate was evaporated, concentrated and evaporated to dryness to get the purified copper sulfate
选项：
A:正确
B:错误
答案: 【错误】

7、 问题:In the experiment of purification of copper sulfate, the pH should be adjusted above 4 to remove iron ion.
选项：
A:正确
B:错误
答案: 【错误】

8、 问题:Chemical reagents are usually divided into four grades according to the purity.
选项：
A:正确
B:错误
答案: 【正确】

9、 问题:Crude copper sulfate usually contains soluble impurities such as ferrous sulfate and ferric sulfate, which can be removed by hydrolysis and filtration after adjusting pH.
选项：
A:正确
B:错误
答案: 【错误】

10、 问题: In the experiment of purification of copper sulfate, except for ferrous ion and iron ion, other trace soluble impurities are removed by remaining in the mother liquor.
选项：
A:正确
B:错误
答案: 【正确】

Chapter 4. Acid-Base Reaction and Buffer Solution Quiz-Chapter 4. Acid-Base Reaction and Buffer Solu

1、 问题:What can be prepared as a buffer solution? 
选项：
A:HCl and NaOH (excess)
B:HCl and NH3·H2O (excess)
C:HAc (excess) and HCl
D:NaOH and NH3·H2O (excess)
答案: 【HCl and NH3·H2O (excess)】

2、 问题:In general, what is the buffer solution?
选项：
A:Solution of weak acid and weak base salt
B:Solution of weak acid or weak base and its salt
C:Solution with constant pH value
D:Solution with constant ionization degree
答案: 【Solution of weak acid or weak base and its salt】

3、 问题:What is the most important buffer pair in human plasma?
选项：
A:–
B:–
C:–
D:–
答案: 【–】

4、 问题:What is wrong with the following description of buffer solution?
选项：
A:When the temperature is constant, pKa and buffer ratio are the most important factors affecting the pH value of buffer solution.
B:After the buffer solution was diluted with water, the pH value and buffer capacity remained unchanged.
C:The effective buffer range of buffer solution is pKa±1.
D:hen the buffer ratio is constant, the larger the total concentration is, the larger the buffer capacity is.
答案: 【After the buffer solution was diluted with water, the pH value and buffer capacity remained unchanged.】

5、 问题:What pH of the standard solutions should be used for calibration when measuring acid solution with acidity meter?
选项：
A:6.86 and 4.00
B:6.86 and 9.18
C:4.00 and 9.18
D:All above.

请输入手机号或商家订单号

打不开请联系客服QQ 2356025045 商家订单号在哪里？点此了解

---

商家订单号查看步骤

打开支付宝

方法一：我的 > 账单 > 账单详情 > 更多>复制商家订单号

方法二：我的 > 账单 >搜索关键字【网课小帮手】
> 账单详情 > 更多>复制商家订单号

方法三：联系客服QQ 2356025045

微信支付

我 > 支付 > 钱包 > 账单 > 账单详情

手机号用于查询订单，请认真核对

支付宝