大学MOOC Analytical Chemsitry(Dalian University of Technology)1458218162 最新慕课完整章节测试答案

chapter 1 Test

1、单选题：
‍Volumetry belongs to（）‎
选项：
A: gravimetry
B: chemical analysis
C: instrumental analysis
D: structure analysis
答案: 【 chemical analysis】

2、单选题：
‍Which one is the right analytical procedures?​
选项：
A: Sampling-Measurement-Calculations of results- Evaluation of data
B: Sampling- Pretreatment-Measurement- Calculations and Evaluation of Data
C: Sampling- Pretreatment-Titration- Calculations and Evaluation of data
D: Sampling- Pretreatment-Measurement- Calculations of results
答案: 【 Sampling- Pretreatment-Measurement- Calculations and Evaluation of Data】

3、单选题：
​ When the size of the sample is between 0.1-10mg, the analysis is called:‎
选项：
A: major analysis
B: minor analysis
C: trace analysis
D: self-minor analysis
答案: 【 minor analysis】

4、单选题：
‎Comparing with chemical analysis, the sensitivity of instrumental analysis is:‌
选项：
A: difficult to judge
B: lower
C: higher
D: similar
答案: 【 higher】

5、多选题：
‌Which one in the following methods can be used to perform a minor analysis? ‌
选项：
A: Electrochemical analysis
B: Ultraviolet-visible spectrophotometry
C: Titrimetry
D: Gravimetry
答案: 【 Electrochemical analysis;
Ultraviolet-visible spectrophotometry】

6、多选题：
‍According to the different analytical tasks, analytical methods can be classified to:‏
选项：
A: qualitative analysis
B: quantitative analysis
C: structure analysis
D: inorganic analysis
答案: 【 qualitative analysis;
quantitative analysis;
structure analysis】

7、判断题：
​Analytical chemistry is call the Information Science in chemistry because of its obtaining informations on chemical compositions and properties of matter.‌
选项：
A: 正确
B: 错误
答案: 【 正确】

8、判断题：
‎The accuracy of the instrumental analysis is always better than that of the chemical analysis.‏
选项：
A: 正确
B: 错误
答案: 【 错误】

9、判断题：
‏Analytical methods are classified into chemical analysis and instrumental analysis according to the principle of measurement.‌
选项：
A: 正确
B: 错误
答案: 【 正确】

10、判断题：
​The significances of analytical chemistry and chemical analysis are the same.‍
选项：
A: 正确
B: 错误
答案: 【 错误】

Chapter 2 TEST

1、单选题：
‎Which of the following can be used to minimize the indeterminate error‍
选项：
A: conducting a blank test
B: increasing number of measurement
C: calibrating the instrument
D: performing a comparative test
答案: 【 increasing number of measurement】

2、单选题：
‎The number of [H+] when pH=3.02 contains exactly (  ) significant figures.‎
选项：
A: 3
B: 4
C: 2
D: 1
答案: 【 2】

3、单选题：
‎In the following statements, which is wrong?‎
选项：
A: the method errors belong to systematic errors.
B: the systematic error are also called determinate errors.
C: the systematic errors can be eliminated.
D: the systematic error follows a Gaussian distribution.
答案: 【 the systematic error follows a Gaussian distribution.】

4、单选题：
‍In order to test if there exists the error introduced by reagent in experiment, which method should be taken.‏
选项：
A: blank test
B: contrast experiment
C: calibration of instrument
D: increase the replicate number of the determination
答案: 【 blank test】

5、多选题：
‌which of the following can be used to eliminate the determinate error‏
选项：
A: conducting a blank test
B: performing a comparative test
C: calibrating the instrument
D: increasing number of measurement
答案: 【 conducting a blank test;
performing a comparative test;
calibrating the instrument】

6、判断题：
‌The concentration of HCl solution is 0.0765, it contains 4 significant figures.‎
选项：
A: 正确
B: 错误
答案: 【 错误】

7、判断题：
‎Accuracy indicates the closeness of the measurement to its true or accepted value.‎
选项：
A: 正确
B: 错误
答案: 【 正确】

8、判断题：
​Precision describes the reproducibility of measurement. ‏
选项：
A: 正确
B: 错误
答案: 【 正确】

9、判断题：
‏Indeterminate error can be corrected by calibrating the   instruments.‌
选项：
A: 正确
B: 错误
答案: 【 错误】

10、判断题：
‎When the confidence level is constant, the more the determining times, the wider the confidence interval.‏
选项：
A: 正确
B: 错误
答案: 【 错误】

chapter 3 Test

1、单选题：
‍ For the following statements, (   ) is wrong.‎
选项：
A:  the larger the Ka, the larger the titration break.
B: the higher the concentration of the titrant, the larger the titration break.
C: the larger the Ks, the larger the titration break.
D: the larger the Ksp, the larger the titration break.
答案: 【 the larger the Ksp, the larger the titration break.】

2、单选题：
​For the following statements concerning αY(H) ,  which is correct?‏
选项：
A: αY(H) decreases as pH decreases.
B: αY(H) is always less than 1.
C: lgαY(H)  approaches zero at high pH.
D: None of the above.
答案: 【 lgαY(H)  approaches zero at high pH.】

3、单选题：
‌For precipitation, the indicators used in Mohr method and Volhard method are （  ）‎
选项：
A: NH4SCN and AgNO3
B: AgNO3 and NH4Fe(SO4)2
C: K2CrO4 and NH4Fe(SO4)2
D: K2CrO4 and NH4SCN
答案: 【 K2CrO4 and NH4Fe(SO4)2】

4、单选题：
‎A NaOH standard solution absorbed a small amount of CO2, if this solution is used to titrate HCl solution and the methyl orange is employed as an indicator, (  ) will be obtained.‏
选项：
A: a higher result 
B: a lower result
C: a correct result
D: uncertain result
答案: 【 a higher result 】

5、单选题：
​Which of the following acids can not be titrated directly by bases.‎
选项：
A: 0.01mol/L CH2ClCOOH (Ka=1.4´10-3)
B: 1mol/L H3BO3 (Ka=5.7´10-10)
C: 0.1000mol/L HNO2 (Ka=7.1´10-4)
D: 0.02mol/L CH3COOH (Ka=1.76´10-5)
答案: 【 1mol/L H3BO3 (Ka=5.7´10-10)】

6、单选题：
‍In determining of Cl- by using Mohr method and Volhard method, the reactions are performed ( )‌
选项：
A: both in acidic solutions
B: both in neutral solutions
C: in neutral and acidic solutions respectively
D: in acidic and basic solutions respectively
答案: 【 in neutral and acidic solutions respectively】

7、单选题：
‌To titrate a sample of alkaline ash with HCl standard solution, taking phenolphthalein as an indicator, V1mL HCl was consumed, then continue to take methyl orange as an indicator, V2 mL HCl was consumed, known that V1<V2，the components of the alkaline ash sample are (   ).‌
选项：
A: Na2CO3＋NaHCO3
B: NaOH＋Na2CO3
C: NaOH
D: Na2CO3
答案: 【 Na2CO3＋NaHCO3】

8、单选题：
​In a direct titration, the metal ion M is titrated with EDTA, then the color of the solution is (  ) at the end of the titration.‏
选项：
A: the color of the complex M-EDTA.
B: the color of the complex M-indicator.
C: the color mixed by the complex M-EDTA and the free indicator.
D: the color mixed by the complexes M-EDTA and M-indicator.
答案: 【 the color mixed by the complex M-EDTA and the free indicator.】

9、单选题：
‎In the following cases, a lower result will be obtained if (  )​
选项：
A: The concentration of HCl solution is standardized by Na2B4O7×10H2O, which loses crystal water partially.
B: The primary standard absorbs moisture from the atmosphere by weighing.
C: For the determination of H2C2O4 percentage in a sample by KMnO4 titrant, the KMnO4 is decomposed because of the high temperature.
D: In the process of the standardization of Na2S2O3 solution, the I2 is slowly volatilized.
答案: 【 The concentration of HCl solution is standardized by Na2B4O7×10H2O, which loses crystal water partially.】

10、判断题：
‍The weak acids H3BO3 (pKa=9.24) and CH3COOH (pKa= 4.75) can be titrated with standard alkaline solution directly. ‎
选项：
A: 正确
B: 错误
答案: 【 错误】

11、判断题：
‎The pH transition range of an acid-base indicator should be dependent on its pKHIn, and should fall in the titration curves completely.‌
选项：
A: 正确
B: 错误
答案: 【 错误】

12、判断题：
‏ In complexometric titration, an effective method for titrating metal ions step-by-step is to control the acidity of the solution.‎
选项：
A: 正确
B: 错误
答案: 【 正确】

13、判断题：
‌Primary standard can be used to prepare standard solution directly.‌
选项：
A: 正确
B: 错误
答案: 【 正确】

14、判断题：
‎Multiprotic weak acid H3BO3 can be titrated directly with standard alkaline solution.‏
选项：
A: 正确
B: 错误
答案: 【 错误】

15、判断题：
‎Increasing the Ksp will narrowen the break of precipitation titration.​
选项：
A: 正确
B: 错误
答案: 【 正确】

Chapter 4 TEST

1、单选题：
‎In potentiometric analysis, potential of silver-silver chloride electrode depends upon (    ).‌
选项：
A: the concentration of Ag+
B: the sum concentration of AgCl and Ag+
C: the activity of Ag+
D: the activity of Cl-
答案: 【 the activity of Cl-】

2、单选题：
‏In potentiometry, the small selectivity coefficient K of an ion-selective electrode indicates (     ).‌
选项：
A: the selectivity of the electrode is poor
B: higher sensitivity of measurement
C: lower sensitivity of measurement 
D: the selectivity of the electrode is good
答案: 【 the selectivity of the electrode is good】

3、单选题：
‌In determination of the pH value of test solution, potential of the cell at 25℃ is (   ).‏
选项：
A: E=jSCE +0.0592lgaH+
B: E=K’+0.0592pH
C: E=jSCE+0.0592pH 
D: E=K’-0.0592pH
答案: 【 E=K’+0.0592pH】

4、单选题：
‍For the analysis of fluoride in water samples in potentiometry, the TISAB solution is elaborated. Which of the following is the role of the TISAB?  (   )​
选项：
A: keeping the ionic strength of the solution constant, adjusting the pH at certain range and masking the interfering ions
B: keeping the ionic strength of the solution constant
C: adjusting the pH at certain range
D: shorting the response time and enlarging the linear response range of the electrode
答案: 【 keeping the ionic strength of the solution constant, adjusting the pH at certain range and masking the interfering ions】

5、单选题：
​In potentiometry, the