BSc Sem VI 2022 2023 Apr 2023 CHEMISTRY ANALYTICAL CHEMISTRY Question Paper - Mumbai University | munotes

Questions asked in this paper

• (2) Figures to the right indicate full marks

1. Q1 Attempt any four of the following. 20 marks
   • A) Draw a polarogram and label all the regions. Explain the role of supporting electrolyte used in polarographic analysis
   • B) Explain the term polarographic maxima with a neat diagram. How is it
   • C) In a polarographic determination of nickel, the wave heights determined for a series of solutions were as follows: Find the concentration in unknown solution
   • D) With the help of labelled diagram, explain dropping mercury electrode Give any one of its limitation
   • E) What are the advantages and limitations of amperometric titrations?
   • F) Give the basic difference between amperometry and voltammetry Explain the nature of amperometric titration curve when both titrand and titrant are reducible, and product is non-reducible
2. Q2 Attempt any four of the following. 20 marks
   • A) Draw schematic diagram of gas chromatograph and explain any two
   • B) Explain electron capture detector in GC and write any one advantage
   • C) Give the applications of gas chromatography
   • D) In GC, components of A and B were found to have retention time of 16.30 min and 13.30 min respectively on a 30 cm column. The peak width at base for components A and B were 1.00 min and 1.30 min respectively. Calculate the average number of plates in the column and plate height of the column
   • E) Explain ion exchange capacity? How is it determined for cation
   • F) Explain any two applications of ion-exchange chromatography in
3. Q3 Attempt any four of the following. 20 marks
   • A) What is food processing? Explain the need of food processing?
   • B) Explain the Lane Eynon method for analysis of lactose in milk
   • C) What are objectives of pasteurization? Explain any two methods of
   • D) Enlist the types of tea and explain any two in detail
   • E) Explain a method to estimate amount of calcium and magnesium in
   • F) Write constituents of lipstick and any three properties of antiperspirant
4. Q4 Attempt any four of the following. 20 marks
   • A) Draw a neat labelled diagram of thermobalance and write the function of any three of its components
   • B) Name the factors which influence the TG curve. Explain thermal decomposition of calcium oxalate
   • C) Distinguish between TGA and DTA
   • D) Discuss thermometric titrations of:
   • E) What are the important applications of DTA?
   • F) Explain linearity and accuracy w.r.t. method validation
5. Q5 A) Select the correct option and complete the following statements: 5 marks
   • a) The diffusion of particles from bulk of the solution to the surface of DME due to the difference in concentration is called
   • b) electrode which has its own potential and cannot take up potential applied on it is called
   • c) Oxygen dissolved in the electrolytic solutions is easily reduced at the DME produces polarogram consisting of
   • d) In polarography the time that lapses between the detachment of two successive drops of mercury is called
   • e) In polarographic analysis the diffusion current is proportional to the
   • f) titrand is reducible but titrant and product are not in
6. Q1 constant current till the equivalence point, then increases
   • ii) decrease in current till the equivalence point, then constant ili) increase in current till the equivalence point, then decreases
   • g) In amperometric titration of Ni** determined by titrating with
   • h) In rotating platinum electrode, the diffusion current is times larger than in case of DME
   • i) 100 ii) 400 iii) 20 State whether true or false: (any five) 05
   • a) The retention time of the mobile phase is called dead time
   • b) Nitrogen gas is used as gas in gas chromatography
   • c) If a component A is more soluble in the stationary phase than component B, then A will come out of the column later than B
   • d) Eddy diffusion is a band broadening factor in chromatography caused by the non-equal path of the solute molecules
   • e) Diatomaceous earth is the commonly used solid support material in gas
   • f) Standard solution of sodium nitrate is used in the determination of capacity of an anion exchanger
   • g) In ion exchange chromatography, density of the resin should be less than that of the water Fill in the blanks with correct alternatives given in the bracket: 05 a physical method of food preservation
   • b) enzyme is present in milk
   • c) is the major pharmacologically active compound in coffee
   • d) present in talcum powder has UV reflection properties
   • e) Honey contains large quantity of than glucose
   • f) properties are detected by the five sense organs
   • g) In estimation of Zinc from deodorants and antiperspirants iS used as a complexing agent
   • h) Nitrates and nitrites are generally used for preservation of Match the columns: (any five) 05
   • a) Reference standard Plateau in TGA
   • d) No loss in mass Thermocouple f) Analysis of polymer Application of DTA g) Ni-Cr Alloy

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