BSc Chemistry SEM IV 2019 20 Oct 2019-20 ATKT CHEMISTRY PAPER III Question Paper - Mumbai University | munotes

Questions asked in this paper

1. Q1 A. Fill in the blanks with suitable option (any 12) 12 marks
   • i. is used as mobile phase in Thin layer chromatography
   • a. Liquid bothaandb
   • ii. Liquid- liquid chromatography is based on
   • a. Adsorption partition
   • iii. Centrifugation is a method of separation
   • iv. Liquid fuels are by \ Crystallization is a method of separation Vi. Paper chromatography is type of chromatography Vii. electrode is used as a reference electrode
   • viii. |The glass electrode is an electrode
   • a. c. reference
   • ix. Null hypothesis is often used as a test of
   • a. repeatability c. uncertainty measures electrochemical properties of the analyte The unit of conductance is
   • xii. Glass electrode is used in
   • xiii. Glass electrode is an example of electrode
   • xiv. For rejection of a result test is used
   • xv. Gaussian curve is
   • xvi. Least square method is used for
   • a. obtaining best fitting line b. testing of significance c. rejection of data
   • xvii. Variance ratio test is also
   • a. F-test xviii. The difference between highest and lowest numerical value is MARKS:100 TIME : 3 Hrs
2. Q1 B. State true or false (any three) i, Distillation is a chemical method 3 marks
   • ii. Mean is not average of all the values
   • iii. Glass electrode is used in pH
   • iv. pH meter can be used for water analysis A test rejected by 2.5d rule cannot be retained by rule Vi. Crystallization is a chemical method of separation
3. Q1 C. Match the columns (any five) Vi. 4.0 drule f. Combination of result Rejection of result 5 marks
   • h. Quinhydrone electrode
4. Q2 Attempt the following (any four) 20 marks
   • A. List the applications of HPLC
   • B. What is the principle involved in separation based on TLC?
   • C. How is distillation used for separation of two liquids?
   • D. Give the principle of zone electrophoresis. What are its applications? What are the different types of distillations?
   • F. 500 cm’ of water contains 100mg of an acid. It is shaken with 50 cm? of organic solvent. 20 mg of acid is unextracted. Calculate the distribution ratio of acid between water and organic solvent
5. Q3 Attempt the following (any four) 20 marks
   • A. Discuss the conductometric titration curve of weak acid vs strong base
   • B. List the advantages and limitations of conductometric titrations
   • C. State the principle of pH metry. What are its applications?
   • D. Explain the construction of glass electrode with a neat labelled diagram
   • E. Explain the basic principle of potentiometric titration What are merits and demerits of quinhydrone electrode?
6. Q4 Attempt the following (any four) 20 marks
   • A. What is null hypothesis? Explain the variance ratio test MARKS:100 TIME : 3 Hrs
   • B. Six samples were analyzed for its mercury content. The values obtained are 2.06,
   • 2.16, 2.12, 1.93, 1.89 and 1.95. Calculate mean, median and mode
   • C. Explain the Q-test for rejection of data
   • D. Explain the 2.5 d rule
   • E. Define: mean, median, mode, variance and average deviation
   • F. Describe the method of averages with respect to linc y =mx +
7. Q5 Attempt the following (any four) 20 marks
   • A. Describe continuous extraction process of solvent extraction when organic solvent is lighter than water
   • B. List the applications of Paper chromatography
   • C. Discuss the advantages and limitations of potentiometric titrations
   • D. What are the merits and demerits of glass electrode?
   • E. Following values were obtained in a sampie analysis 4.6, 4.7, 4.5, 4.9. on the basis of Q test, find whether 4.9 can be rejected or retained. (Given = 0.76)
   • F. Explain the 4.0 d rule

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