Guru Nanak Dev University 2006-3rd Sem B.Sc Chemistry BASIC ANALYTICAL (Chem-304) (, 2k6) - Question Paper

5414
2126
B.Sc. (H.S) (Third Semester)
CHEMISTRY
Paper - Chem-304
(Basic Analytical chemistry)

Time Allowed : three Hours
Maximum Marks : 100

part - A

Note :- All ques. are compulsory. every ques. carries two marks.

1. discuss the significance of accuracy and precision in quantitative analysis.

2. Write the steps involved in Sampling Operation.

3. describe the terms spread or range and coefficient of variation.

4. What is a common feature of the visual complexometric, precipitation, acid-base, and redox titrations ?

5. discuss the importance of stoichiometry in chemical analysis.

6. What is a buffer solution and elaborate its properties.

7. Differentiate ranging from iodimetry and iodometry.

8. discuss why carbonate fault occurs and how it can be minimized.

9. Distinguish ranging from redox reaction reaction and redox couple.

10. List 4 requirements that must be met by a chemical reaction to make it suitable as the basis of a titrimetric method of analysis.

part - B

Note : Attempt any 8 ques.. every ques. carries 5½ Marks.

1. What factors should be considered while designing a sampling plan? explain the difference ranging from stratified sampling and random sampling.

2. What do tou understand by the term fault in chemical analysis? elaborate the sources of errors and how are they removed?

3. What do you mean by equilibrium constant expression? List the kinds of equilibrium constants encountered in analytical chemistry.

4. explain briefly the importance of lowest square analysis in the treatment of analytical data.

5. Why stirring is done during the addition of precipitating reagent? What is the effect of pH on the solubility of precipitate?

6. Giving suitable examplws define a differentiating solvent and a levelling solvent.

7. What is meant by Nernestian behaviour of an indicator electrode? List the sources of errors in pH measurement with a glass/SCE assembly.

8. Refer to the attachment at the end of the ques. paper.

9. provide the theoretical quantitative treatment of EDTA titrations. Write the structures of any 2 metallochromic indicators.

10. (a) elaborate redox reactions. provide 2 examples.
(b) Why is iodine solution prepared by dissolving iodine in concentrated potassium iodide, increased in molarity with standing? Write the balanced net ionic formula that accounts for this increase.

11. Write a short note on physiological buffers.

12. elaborate the important factors that contribute to the quantative extraction of a species? Why a number of extractions with a small quantity is preferred to a single extraction with the identical total quantity of the solvent?


part - C

Note : Attempt any 2 ques..Each ques. carries 18 marks.

1. Write a detailed account of the potentiometric titrations involving oxidizing and reducing agents citing suitable examples. elaborate their advantages over visual titrations?

2. Write short notes on the subsequent :-
(a) Logarithmic concentration diagrams.
(b) Solvent extraction by flow injection analysis.
(c) Standard and formal redox potentials.

3. What statistical analysis is usually carried out to evaluate the relation ranging from 2 variables measured simultaneously? How this relationship is found by calculating correlation coefficient? Also write about correlation determination.

4. Refer to Attachment

Earning:   Approval pending.