BSc Chemistry SEM V 2018 19 2018-19 Chemistry Analytical Chemistry Question Paper - Mumbai University | munotes

Questions asked in this paper

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1. Q3 Use of log table/non-programmable calculator is allowed
2. Q1 Answer any four of the following: 20 marks
   • A) Explain the term quality & quality control
   • B) Concentrated H2SO4 (MW=98) has density of 1.84 and contains 86% H2SOu Calculate its concentration in molarity, and convert it into normality
   • C) Calculate the percentage composition of each element in sodium hydrogen phosphate [Given atomic weight of; H=1, P=31, O=16,Na= 23]
   • D) Discuss the importance of quality concepts in industry
   • E) Discuss the sampling of homogeneous and heterogeneous liquid
   • F) Describe displacement method for the sampling of gases, with a neat labelled diagram
3. Q2 Answer any four of the following: 20 marks
   • A) Discuss the theory of redox indicators and explain the criteria for selection of an indicator in
   • B) What are metallochromatic indicators? Mention any four desired properties of a good
   • C) 10.cm? of 0.1M Fe(II) solution is titrated with 0.1M Ce(IV) in acidic medium. Calculate the
   • (i) at the equivalence point on addition of two times the volume of titrant required at the equivalence point
   • D) 25.0cm? of 0.1M Fe(II) is titrated with 0.02M at pH 1.5. Calculate the potential at the
   • E) “EDTA 1s a reagent of choice in many analytical laboratory, in spite of its low selectivity” — Explain direct titrations and back titration w.r.t. EDTA titrations
4. Q3 Answer any four of the following: 20 marks
   • A). Discuss the principle of AAS
   • B) Explain the use of hollow cathode lamp, with a labelled diagram, giving one disadvantage
   • C) Derive a mathematical relationship between the intensity of fluorescent radiation and concentration of the solution
   • D) Draw aschematic diagram of turbidimeter and explain turbidimetric titrations, using
   • E) With the help of a diagram, describe premix burner mentioning any two of its advantages What is phosphorescence? Draw a schematic diagram of phosphorimeter and discuss its working explaining the role of shutter
5. Q4 Answer any four of the following: 20 marks
   • A) Explain the various factors affecting solvent extraction
   • B) Define [pH]12 and explain its significance, with a graph of percentage extraction versus pH
   • C) What are the applications, advantages and limitations of solid phase extraction?
   • D) Explain the function of pump in HPLC. Name any two pump used in HPLC, giving one advantage and limitation of each type
   • E) What is the role of detector in HPLC? Discuss UV detector used in HPLC, mentioning its
   • F) Mention various steps involved in HPTLC. Write any two advantages and limitations of
6. Q5 A) Answer any five of the following, in one sentence: 5 marks
   • a) What are analytical reagent?
   • b) What is the molarity 0.1N HCI solution?
   • c) What is the milliequivalents of 20cm? in
   • d) Name the most commonly used reagent for dissolution of silicate rocks
   • e) Name any one equipment used for sampling of compact solids
   • f) Name any one most common flux used in the analysis of compounds of alkali metals
   • g) Give the relationship between sampling error and square root of the number of samples
   • h) Name any one method for size reduction w.r.t. sampling of solids
   • B) Answer any five of the following in one sentence: 05
   • a) What is the role of phosphoric acid in the redox titration of versus Cr2O7* using
   • b) the reversible reaction of diphenylbenzidine indicator in redox titration of Fe** vs
   • c) Name the most commonly used indicator in the redox titration of versus Ce* in acidic
   • d) Give any one advantage of EDTA as titrant
   • e) Give expression for absolute stability constant, for the reaction involving fully ionized form of EDTA and
   • f) Give an example of indirect titration with respect to EDTA titrations
   • g) the type of EDTA titration involving the following reaction
   • h) is tris(1,10-phenanthroline)iron(I)sulphate commonly known as?
   • C) Fill in the blanks (any five) 05
   • a) involves measurement of intensity of light as a function of concentration of dispersed phase In AAS, the steady light from hollow cathode lamp is converted in to pulsating light
   • c) In nephelometry, the detector is usually, but not necessarily, placed at angle to the
   • d) Acalibration curve, in flame photometry, is a plot of against concentration
   • e) The commonly used radiation source in fluorimeter is lamp
   • f) In the expression w.r.t. turbidimetry, S=Ktc, stands for
   • g) Increase in viscosity of the solution, will the intensity of emitted light in FES
   • D) State true or false (any five) 05
   • a) In HPLC, role of precolumn is to remove impurities from the sample solution
   • b) UV detector is used in HPTLC
   • c) Immiscible solvent pairs can be used for HPTLC separations
   • d) Separation of solute in HPTLC takes place by phenomenon of partition
   • e) Development time in HPTLC is that of TLC
   • f) Refractive index detector is highly temperature sensitive
   • g) Degasser system is used in HPLC, to remove dissolved gases from solvent

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