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

Questions asked in this paper

• 2. Figures to the right indicate full marks

1. Q3 Use of log tables /non-programmable calculator is allowed
2. Q1 Attempt any three of the following :—
   • (A) Explain the determination of equivalence point in potentionmetric titrations using 5 the graph of —
   • (i) AE/ AV versus V, and
   • (B) A solution of polyvalent ions having diffusion coefficient 5 0.69 x 10-5 when reduced polarogrphically, gave a diffussion current of 7.168 x A, with a mercury flow rate of 2.34 mg s! and a drop time of 4.3 s Calculate the number of electrons transferred per ion in the reduction reaction
   • (C) The diffusion coefficient of oxygen in aqueous solution is 2.65x 5 DME with of 1.86 was used to assay a natural water sample. The diffusion current of the first oxygen wave was 2.3 UA. Calculate the concentration of dissolved oxygen in the water
   • (D) Give any three advantages and two limitations of amperometric titrations. 5
   • (E) Explain the basis of qualitative and quantitative polarography. 5
   • (F) Discuss the nature of amperometric titration curve when : 5
   • (i) titrant alone in reducible, and
   • (ii) titrand alone in reducible
3. Q2 Attempt any three of the following :
   • (A) Discuss the role of pH in preservation of food. 5
   • (B) Describe a method for determination of sodium benzoate as a preservative in food. 5
   • (C) Explain a method for analysis of lactose in milk. 5
   • (D) Mention the constituents and composition of coffee, explaining the role of chicory 5
   • (E) Write the constituents of lipstick. Discuss the ash analysis of lipstick. 5
   • (F) What are antiperspirants and deodorants ? Write the constituents and any two 5 properties of antiperspirants and deodorants
4. Q3 Attempt any three of the following :
   • (A) With the help ofa neat diagram, explain the working of an electron capture detector in GC, with any two advantages
   • (B) The following data was obtained using liquid chromatographic column of length. Component A and B were found to have retention time 6.0 min min respectively. The peak width at the base for component A was 30.6 s and for B was 79.2 s Calculate the number of plates for each peak and the plate height for
   • (C) Give the comparison between GSC and GLC. 5
   • (D) Define the term ion exhange capacity. How is the capacity of cation exchanger 5
   • (E) How is demineralisation of water and separation of amino acids done using 5
   • (F) Discuss column material and column packing w.r.t. size exclusion chromatography. 5
5. Q4 Attempt any three of the following :
   • (A) What is a thermogram ? Discuss the factors influencing thermogram. 5
   • (B) Discuss basic principle of DTA. 5
   • (C) What are thermometric titrations ? Explain its application in the titration of 5
   • (D) Draw schematic diagram of thermobalance and explain the function of its components. 5
   • (E) What are advantages and limitations of NAA ? 5 Discuss DTA curve of 5
   • (i) and
   • (ii) CuSO,-5H,O
6. Q5 (A) Fill in the blanks : 4 marks
   • (a) Diffusion current is the current observed in polarography, when the magnitude of the current is limited only by the rate of diffusion of the reactant to the DME surface
   • (b) The mass of 20 drops of mercury was found to be 0.132 g and the drop time was 4.94 s. Hence flow rate of mercury from capillary =
   • (c) Three electrode system in polarography employes as a working
   • (d) Potentiometric titration involves measurement of potential as a function of
   • (A) State true or false : 4
   • (p) A nonfaradic current is the charging current that produce a charged double
   • (q) Excess of maxima suppressor can diminish polarographic wave
   • (r) Potentiometric titration cannot be used for turbid solution
   • (s) Polarographic technique can be used for determination of stability constant of the complexes
7. Q5 (B) Fill in the blanks : 4 marks
   • (a) Chemically, talc is
   • (b) The role of titanium oxide in face powder is to reflect light
   • (c) Green tea has amount of caffeine than coffee
   • (d) Primary component of vinegar which acts as perservative in slightly acidic
   • (B) State true or false : 4
   • (p) Food treated with irradiation becomes radioactive itself
   • (q) Tannin present in tea leaves in water insoluble
   • (r) Pasterurisation method of preservation is same as sterilisation
   • (s) Honey contains more amount of fructose than glucose
8. Q5 (C) Fill in the blanks : 4 marks
   • (a) Time required to elute a solute from the column in gas chromatography is called as time Inion exchange chromatography, the functional group that is responsible for exchange of ions is called as ion
   • (c) exchange chromatography, higher the concentration in solution is the exchange
   • (d) exclusion charomatography, larger molecules are retained on the column for time than smaller molecules
   • (C) State true or false 4
   • (p) Gas chromatography can be used for analysis of thermally unstable compounds
   • (q) exchange chromatography, the stationary phase is a solid
   • (r) Trace metal ions in sea water can be concentrated using ion exchange
   • (s) Size exclusion chromatography is used to separate large molecules of biological
9. Q5 (D) Fill in the blanks : 3 marks
   • (a) TGA is a technique in which change in of the substance is recorded as a function of time or temparature
   • (b) In the expression, N 0.6 (1 — stands for :
   • (c) Thermogram obtained in thermometric titration of boric acid versus NaOH
   • (D) State true or false :— 3
   • (p) NAA cannot be used for detection of trace impurities in Si and Ge samples
   • (q) Temparature difference between the sample and the reference material, in DTA, is measured by furnace temparature programmer
   • (r) Neutron flux is number of neutrons per sq. m per second

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