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 B. State true or false (any three) 3 marks
   • i. Fractional Distillation is a chemical method
   • ii. Mean is average of all the values iii, Quinhydrone is used in Potentiometric titrations
   • iv. pH meter cannot be used for water analysis A test rejected by 2.5d rule can be retained by 4.0d rule Vi. Precipitation is a physical method of separation
2. Q1 C. Match the columns (any five) . 5 marks
   • i. Saturated KCl :
   • b. Melting point
3. Q2 Attempt the following (any four) 20 marks
   • A. List the applications of TLC
   • B. Explain the ascending technique used in paper chromatography
   • C. Explain the two-dimensional technique used in paper chromatography
   • D. Write a note on applications of HPLC E, 500 cm’ of water contains 100mg of an acid. It is shaken with 50 cm? of solvent. 20 mg of acid is unextracted. Calculate the distribution ratio of acid between water and organic solvent
   • F. State the principle of solvent extraction, What are its advantages?
4. Q3 Attempt the following (any four) 20 marks
   • A. Describe the experimental procedure for carrying out potentiometric titration
   • B. List the advantages and limitations of conductometric titrations
   • C. Discuss the conductometric titration curve of strong acid vs strong base
   • D. What are the applications of pH metry in biological and environmental analysis?
   • E. Explain the basic principle of potentiometric titration What is glass electrode? Draw a neat labeled diagram of glass electrode. List its MARKS:100 TIME : 3 Hrs NOTE: i) All the questions are compulsory
   • ii) Figures to right indicate full marks
   • iii) Use of non —programmable calculator log table is allowed
5. Q1 A. Fill in the blanks with suitable option (any 12) 12 marks
   • i. Solids are separated by
   • ii. Centrifugation is a method of separation ili. In TLC chromatography, mobile phase is
   • iv. Solvent extraction is based on Electrophoresis is based on
   • vi. Saturated calomel electrode is used as a electrode
   • vii. Separation factor in solvent extraction is the ratio of of two solutes
   • viii. | Membrane electrode is electrode
   • a. Platinum b. quinhydrone
   • ix. The unit of cell constant in conductometry is The unit of conductance is
   • xii. acid base potentiometric titrations is used as a reference electrode
   • a. quinhydrone glass test is used for ‘ :
   • a. Rejectionofdata testing of significance c. obtaining best fitting !ine
   • xiv. The rule is used for
   • a. Rejection of result b. testing of significance comparison of means
   • xv. Gaussian curve is symmetrical around
   • a. s cx
   • xvi. square method is used for
   • a. obtaining best fitting testing of significance c. rejection of data
   • xvii. Range is the difference between
   • a. any two two middle values highest and lowest numerical value liquid chromatography is based on / MARKS:100 TIME : 3 Hrs
6. Q4 Attempt the following (any four) 20 marks
   • A. What is null hypothesis? Outline a procedure for the application of null hypothesis to
   • B. Give the Gaussian distribution curve. Write its salient features,
   • C. Explain the Q-test for rejection of data
   • D. Describe the method of averages with respect to line passing through origin
   • E. Explain the 2.5 d and 4.0d rule 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
7. Q5 Attempt the following (any four) 20 marks
   • A. List the applications of Paper chromatography
   • B. Discuss the principle of electrophoresis. List its applications,
   • C. Discuss the construction and working of Quinhydrone electrode
   • D. Discuss the advantages and limitations of potentiometric titrations
   • E. Define: mean, median, mode, variance and average deviation
   • F. Following values were obtained in a sample 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)

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