BSc Sem V 2023 2024 Jan 2024 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) Discuss various grades of laboratory reagents
   • B) Calculate mass percent composition of each element in (Given: atomic mass of C = 12, H= 1,0 =16)
   • C) Calculate the number of grams of pure required to prepare 250 of 0.1 N solution. This is to be titrated with HCl according to equation CO3” + 2 H* > (Given: atomic mass of 23, C = 12,0 = 16)
   • D) Describe the sampling of homogeneous and heterogeneous liquid
   • E) Name different methods of reduction of sample size in sampling of solid. Explain any two of them
   • F) Explain the terms quality and quality control
2. Q2 Attempt any four of the following. 20 marks
   • A) What are the advantages and limitations of EDTA as titrant?
   • B) What are redox indicators? Explain the use of iron(II)
   • C) Calculate the potential of the system in the titration of 10 of 0.2M against 0.2M Ce(IV) solution when:
   • D) How is the selectivity is enhanced in the complexometric titrations by the following:
3. Q1 kinetic masking 1i) use of masking and demasking agents
   • E) What are metal-ion indicators? What are their requirements?
   • F) Derive an equation for potential of the system at equivalence point in the titration of Fe(II) against
4. Q3 Attempt any four of the following. 20 marks
   • A) Discuss the principle of Atomic Absorption Spectroscopy. Explain the role of rotating chopper in AAS
   • B) Discuss the basic principles of FES
   • C) Explain the applications of fluorescence spectroscopy
   • D) Explain the principles underlying the emission of fluorescent light How does fluorescence differ from phosphorescence?
   • E) Draw a schematic diagram of turbidimeter and explain
   • F) What are the important factors affecting the scattering of radiation? Explain any two
5. Q4 Attempt any four of the following. 20 marks
   • A) Explain any two factors affecting solvent extraction
   • B) Discuss the different steps involved in process of solid phase
   • C) Explain the terms used in HPLC 1) isocratic elution ii) gradient elution. Give any three applications of HPLC
   • D) With a neat and labelled diagram explain the working of HPLC
   • E) Give applications and limitations of HPTLC
   • F) Explain double beam densitometer used in HPTLC. Give any two advantages of HPTLC
6. Q5 A) Select the correct option and complete the following statements: (any five) 5 marks
   • a) material can be used for verification of method validation
   • b) The next step after quality control is
   • c) of mole fraction of solute and
   • i) 1 1.5 ii) 2.5
   • d) is a method of expressing concentration in a solution on
   • e) Flushing method is used for sampling of
   • f) is used for sampling of compact solid
   • g) The ratio of weight of sample to total weight of bulk is
   • h) is used for sampling of flowing liquid
7. Q5 B) State whether true or false: (any five) 5 marks
   • a) In the titration of with cerium(IV); undergoes
   • b) Potassium permanganate acts as self indicator in redox titrations
   • c) distribution law is applicable in redox titrations
   • d) is defined as
   • e) amine is the first indicator to be used in redox titrations
   • f) of EDTA is not affected by pH
   • g) Murexide is obtained from purpuric acid
8. Q5 C) Fill in the blanks with correct alternatives given in the bracket: 5 marks
   • a) AAS is used to detect like Cu, Ni, Zn and Hg in food
   • b) The fuel used in a premix burner in FES is
   • c) The nebulizer converts the sample solution
   • d) Delayed re-emission of absorbed radiation is called
   • e) Phosphorimetric experiments are normally carried out at
   • f) the expression w.r.t. turbidimetry, S=Ktc, ‘K’ stands for y
   • g) the detector is usually, but not necessarily, placed at angle to the incident radiation
   • h) A turbidimeter measures as a function of concentration of
9. Q5 D) Match the columns: (any five) 5 marks
   • b) Multistage separation (ii) extracted in organic
   • g) Densitometer (vii) Easily extracted in aqueous
   • (ix) | Extraction of uranyl nitrate

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