TYBSc Chemistry Sem 6 Analytical Chemistry Question Paper PDF 2026 - Mumbai University | munotes

Questions asked in this paper

• Please check whether you have got the right question paper
• 2. Figures to the right indicate full marks

1. Q3 Use of log table/ non-programmable calculator is allowed
2. Q1 Answer any three of the following. 15 marks
   • A) Explain the following terms, with suitable example w.r.t. polarogrpahy
3. Q1 Polarisable electrode Give any two advantages of the polarisable electrode used in polarography
   • B) A5.0x solution of ions in 0.1M KCl gave a diffusion current of 4.1 pA. If the rate of flow of mercury drops and drop time are 1.5 mg 2.5 s respectively, calculate the diffusion coefficient of Ba”* ions
   • C) Give the basic difference between amperometry and voltammetry. Explain the nature of amperometric titration curve when titrand and titrant both are reducible, giving suitable example
   • D) Ina polarogrpahic technique, of standard solutions containing metal ions were prepared and wave heights were measured. The results obtained were as follows An unknown solution under identical condition gave a wave height of 54.0 mm. Calculate the concentration of metal ions in the unknown solution
   • E) Name any two indicator electrodes used in acid-base titrations in potentiometry. Explain the determination of equivalence point in potentionetric titrations using the graph of versus V the advantages and limitations of amperometric titrations?
4. Q2 Answer any three of the following. Explain the use of acetic acid, lactic acid and sulfites as food preservatives 15 marks
   • B) Discuss the method of determination of boric acid as a preservative
   • C) Explain different types of tea
   • D) the composition of face powder. How is magnesium estimated in face powder?
   • E) method for analysis of lactose in milk
   • F) What are the constituents of antiperspirants? Mention any three of its properties
   • Q.P. Code :04774
5. Q3 Answer any three of the following. 15 marks
   • A) What is the role of detector in GC? With the help of a labelled diagram, explain the working of flame
   • B) The following data was obtained on using liquid chromatographic column of 20 cm length of packing. The non-retained component appeared at 1.2 min. Components A and B were found to have retention time of 6.8 min and 12.2 min respectively. The peak width at the base for component A was 0.41 min and for component B was 1.26 min. Calculate the number of plates for each peak and the plate height for the column
   • C) What is ion-exchange capacity? How is it experimentally determined for a cation exchanger?
   • D) Discuss the application of ion-exchange chromatography
   • i) separation of amino acids, and
   • ii) preparation of standard solution of an acid
   • E) Compare the technique of GSC with GLC
   • F) Discuss the principle of size exclusion chromatography
6. Q4 Answer any three of the following. 15 marks
   • A) Mention any five essential requirements of a good thermobalance
   • B) With the help of a labelled diagram, explain the function of any three components of DTA
   • C) What is a TG curve? Discuss the TG curve for the thermal decomposition of H20
   • D) Distinguish between TGA and DTA
   • E) What are thermometric titrations? Explain the application of thermometric titration in the titration
   • F) What are the advantages and limitations of neutron activation analysis?
7. Q5 A the blanks. 4 marks
   • a) Supporting electrolytes used in polargraphy are generally salts of metal
   • b) A plot of current against DME potential is called
   • c) equation forms the basis of quantitative analysis, by polarography
   • d) In potentiometric titration, is measured after addition of each increment of titrant
   • A. State true or false. 04
   • p). Residual current in polarography is regarded as faradaic current A potential at which current flowing through the polarographic cell is equal to one half of the limiting value is called half wave potential
   • r) electrode, in three electrode system, in voltammetry is the electrode that is coupled with working electrode, but plays no part in determining the magnitude of potential being measured Potentiometric titration can be used for determination of phosphoric acid content in aerated drinks
   • Q.P. Code :04774
8. Q5 B Fillin the blanks. 4 marks
   • a) Food preservation is necessary to the shelf life of food
   • b) properties are detected by the five sense organs
   • c) For determination of reducing sugars in honey, by Cole’s ferricyanide method, is used as an internal indicator
   • d) The most pharmacologically active compound in B State true or false. 04
   • p) Few of the traditional methods of food drying, salting and pickling
   • q) pH used asa divider between high acid and low acid foods
   • r) Chicory gives bitterness to coffee
   • s) Lipstick consists of an oily based material and coloring agents Fill in the blanks. 04
   • a) The measure of separation between two peaks in chromatogram is called
   • b) GSC separation is based on selective of gaseous sample on the solid stationary phase
   • c) Larger the value of selectivity coefficient, is the affinity of ions in solution for the resin
   • d) chromatography, higher the concentration of ions in the solution, is the exchange C State true or false
   • p) resolution can be improved by decreasing the number of theoretical plates
   • q) Sample port temperature in GC is kept at the boiling point of the most volatile component
   • r) Weakly basic anion exchanger is a pH greater than 7
   • s) The rate of migration of solute in GC, is independent of the volume of stationary and mobile phase
9. Q5 D Fillin the blanks. 3 marks
   • a) flux is the number of per square centimeter per second
   • b) Al203 is most widely used material for DTA
   • c) Thermogram obtained in thermometric titration of Ca*? and Mg*? against EDTA shows State the true or false. 03
   • p). Thermal neutrons are used to produce radioactive isotopes in NAA Physical changes taking place in the sample in DTA are generally represented by an endothermic
   • r) Curved portion in TG curve indicates the regions of no weight loss

Read from the scan above, so a character or two may differ. The scan is the original.