d 292 - vidyarthiplus

WS 5

B.E./B.Tech. DEGREE EXAMINATION, APRIL/MAY 2003.

Fourth Semester

Chemical Engineering

CH 245 — INSTRUMENTAL METHODS OF ANALYSIS

Time : Three hours Maximum : 100 marks

Answer ALL questions.

PART A — (10 × 2 = 20 marks)

1. What is meant by electromagnetic radiation?

2. State Beer-Lambert's law.

3. Explain the principle of scanning double-beam spectrophotometer.

4. What are the advantages of photometric titration?

5. Define specific refractometry and molecular refractivity.

6. Write any two applications of polarimetry.

7. Write Nernst equation.

8. Define single electrode potential.

9. State Mosley's law.

10. Write the important requirements of a carrier gas in gas chromatograph.

PART B — (5 × 16 = 80 marks)

11. Write a note on the following : (4 × 4 = 16) (i) Sources of radiation and detectors in UV spectroscopy.

(ii) Thermo gram of CaC2O4H2O.

(iii) Ion selective electrodes.

(iv) Reference electrodes.

D 292

WS 5

D 292 2

12. (a) (i) Limitations and deviations of Beer-Lambert's law. (8) (ii) Explain briefly Duboscq calorimetry with neat diagram. (8)

Or (b) (i) What is IR spectroscopy? Explain the different region of IR. (8)

(ii) Discuss the source, important parts and detectors of IR spectroscopy. (8)

13. (a) Explain the principle, instrumentation and applications of AAS. (16)

Or

(b) Explain the principle, instrumentation and applications of refractometry. (16)

14. (a) Explain the measurement of PH by potentiometry and discuss the advantages. (16)

Or (b) (i) What is X-ray diffraction? (4) (ii) How X-rays are produced and detected by X-ray diffraction? (12)

15. (a) Write a note on (i) Thermometric method of analysis and its applications. (8)

(ii) Differential thermal analysis and its applications. (8)

Or

(b) Discuss briefly the principle, apparatus used and its working and advantages of HPLC. (16)

———————

.:.

IG 11351

B.E./B.Tech. DEGREE EXAMINATION, MAY/JUNE 2009.

I Fourth Semester


CH 245 - INSTRUMENTAL METHODS OF ANALYSIS

Time : Three hours

Answer A1.L questions.

PART A - (10 x 2 = 20 marks)

Maximum: 100 marks

1. Give the relationship between wavelength and energy of electromagnetic radiation.

2. State any two reasons for the deviation of Beer-Lambert's law.



5. Define specific and molecular refractivity.

6.

Write Nernst equation.

/ 7. Define single electrode potential.

8. Define Mosley's law.

9. Draw the thermo gram of the compound calcium oxalate dihydrate.

10. 'Explain the principle of HPLC.

PART B - t5 x 16 = 80 marks)

11. (a) What is meant by electromagnetic radiation? Describe the various regions of electromagnetic radiation. (16)

Or (b) (i) Write a note on nesslerimetry. (8)

(ii) Explain briefly Duboscq calorimetry with neat diagram. (8)

12. (a) (i)

What is UV spectroscopy? Give UV spectroscopy.

some applications of (8)

(ii) Discuss the source, important parts

UV spectroscopy.

and detectors of (8)

Or

(b) Explain Woodward Fischer rules for the calculation of absorption maxima of carbonyl compounds. (16)

13. (a) Explain the principle, instrumentation and applications of AAS. Discuss the various interferences in AAS. (16)

Or


14. (a) Discuss with suitable example how the oxidation - reduction titrations

and precipitation titrations can be performed potentiometrically. (16)

Or

(b) (i) What is Bragg's law? Derive the equation n A. = 2 d sin e . (8)

(ii) Discuss how X-rays are produced and detected by X-ray,£fraction. (8)

15. (a) Write a note on : Ii) Thermometric method of analysis and its applications.

(ii) Differential thermal analysis and its applications.

(8)

(8)

Or (b) Discuss briefly the principle, apparatus used and its working and

advantages of GAS CHROMATOGRAPH. (16)

2

G 1135

2. 3. 4.

B.E./B.Tech. DEGREE EXAMINATION, MAY/JUNE 2009.. --- »> Fourth.Semester



Time : Three hours Maximum: 100 marks


PART A - (19 x 2 = 20 marks)

1. What is the relation between wavelength and energy of electromagnetic radiations?

2. State Beer-Lambert's Law.

3. Draw the energy level diagram for any tWOIJ.klT""C""

4. Writ.p~tes on effects ~ ~~-------- ~----;,. fractometry.

n the absorption maxima.

6. Explain the term "cotton effect". .i-> 7. Give a short note on SHE.

8.

Define specific' conductance and equivalent conductance. / 9. Write a short note on "development" of a chromatogram.

10. What is meant by Rfvalue?

ART B - (5 x 16 = 80 marks) -- ~1. (a) Discuss the quantitative analysis of Ni salt using Dubosq

colorimeter.

(b)

(ii) List out the limitations and deviations of Beer-Lambert's Law.

Discuss in detail about clas~trum~nta1 methods based on physical properties. ~

----- - 12. (a) Discuss the various component of UV spectrophotometer'

Or ,(p) Explain the working principle of Fourier transform spectrophotometer

with a neat sketch and state the applications.

13. (a) Describe the instrumentation of AAS and mention about its applications.

Or (b) Discuss the instrumentation and application of refractometry.

14. (a) (i) Derive Nernst's equation for the calculation of single electrode potential.

(ii) Explain with principle how would you detect the end point in

(1) Acid-base titration

(2) Precipitation titration by potentiometrically.

Or

(b) (i) What are reference electrodes? Describe the construction of Calomel electrode.

(ii) What are ion selective electrodes? Explain its working principle.

15. (a) (i) List out the applications oy1IPLC and write one liquid mixture separation in detail.

(m

Explain the term chromatography.' What is the principle of ~a_s _______ == chromatography? --- ----

Or (b) (i) Describe the theory, instrumentation and application of GLC.

(ii) What are the relative advantages of TLC over column chromatography?

--

2

JSl24

B.E./B.Tech. DEGREE EXAMINATION, NOVEMBERIDECEMBER 2008.

FourthSeDnester

Chenrical Engineering

CH 245 - INSTRUMENTAL METHODS OF ANALYSIS Time : Three hours


PART A - (10 x 2 = 20 marks)

1. State Lambertz Law.

2. Explain the term transmittance.

Maximum : 100 marks

3. Explain why only quartz cells are used. in vacuum ultra violet region.

4. What are non polarised and plane polarised lights?

5. The "-4,, * transition in ethylene occurs at 180 nm, but in 1,3 butadiene it occurs at 214 nm. Assign reason.

6. Define the following (a) Unit cell

(b) Space lattice

7. What is electrode potential?

8. What type of information does TGA provide?

9. What is meant by development of chromatogram?

10. What is meant by gas chromatography?

11.

(a)

(i)

(ii)

PART B - (5 x 16 = 80 marks)

Discuss the principle, instrumental details and colourimetry.

Mention important application ofUV spectroscopy.

working of (10)

(6

)

Or

(b) (i) Discuss IR spectra and its utilization in identification of compounds. (10)

(ii) H20 has three vibrational modes. Explain. (6)

12. (a) (i) Draw the block diagram of polarimeter and explain the function of each part. (12)

(ii) What is meant by optical activity? (4)

Or

(b) Explain the principle and application of atomic absorption spectroscopy. (16)

13. (a) Discuss all types of Conductometric titrations. Explain the nature of the graph between conductance and volume of titrant used. (16)

/ Or (b) (i) Describe the construction of a calomel electrode.

(ii) Derive Nernst' s equation.

14. (a) Explain the principle of X-ray diffraction studies.

(8)

(8)

(16)

Or

(b) Construct the block diagram ofDTA and compare it with DSC.

(16)

15.

(a)

(i)

(ii)

Illustrate how separation of mixture could be column chromatography.

What is the principle of gas chromatography?

effected by using (8)

(8

)

(b)

(i)

(ii)

Or

Outline the method of separation mixture using gas chromatography.

Explain the principle of HPLC. 2

5.

;

Reg. No.:

L--L~ __ ~~ __ ~~ __ ~-L __ L--L~

IT 31451

B.E./B.Tech. DEGREE EXAMINATION, APRILIMAY 2008.

Fourth Semester



(Regulation 2004)

Time: Three hours


PART A - (10 x 2 = 20 marks)

Maximum: 100 marks

1. Define wave number. Convert 2500 nm into wave number and indicate which

part of electromagnetic spectrum this wavelength belongs to?

2. What is Beer-Lambert's law and give its importance?

3. Give the spectral range of UV and visible spectrometers.

4. Write about vibrational spectroscopy and its uses.

5. Give the significance of AAS.

6. What is plane polarised light? Give its importance.

7. How will you prepare standard Hg2C12 electrode and give its importance?

8. Where glass electrode is used? Give its constituents.

9.

Give the applications of Thin Layer Chromatography.

10. What detectors are used in Gas Chromatograph?

PART B - (5 x 16 = 80 marks)

11. (a) Discuss the permitted energy levels for the electrons of an atom and simple molecule. (16)

Or

(b) (i)

Explain the principle and diagram of Duboseq colorimeter.

(8)

(ii) What are the advantages and limitations of instrumental methods of analysis? (8)

12. (a) Write the sources, optical parts, cells and detectors of UV-visible spectroscopy. (16)

Or

(b) (i)

Give the methods of sample preparation in IR analysis.

(4)

(ii) What standard is used to check the correctness of IR instrument?(2)

(iii) How intermolecular and intramolecular hydrogen bonding is differentiated in IR studies? (10)

13. (a) (i)

How atomic absorption spectroscopy is designed?

(8)

(ii) What are the various interferences observed in AAS?

Or

(8)

(b) (i)

Define Refractive index.

(4)

(ii) How Abbe refractometer is constructed?

(8)

(iii) Draw the schematic diagram of Polarimeter and explain its operation. (4)

14. (a) (i)

How standard hydrogen electrode IS constructed? Give its limitations? (5)

(ii) Explain the titration of 0.1 Hel Vs 0.1 NaOH using pH metery. (8)

/

(b) (i)

Write about conductivity cell and cell constant.

(6) (ii) Conduct a conductometric titration for a solution containing HCI

and CH3COOH versus NaOH and draw the curve and give its importance.

(10)

15. (a) (i)

Classify the chromatographic methods and how mixtures of organic compounds are separated in GC. (8)

(ii) How columns in GC are selected and explain why S.S IS used

instead of Glass column? (8)

Or

(b) Write notes on :

(i) Redox reaction and titration

(ii) Nernst equation and its importance

(iii) HPLC and its components.

3

(5)

(5)

(6)

T 3145

)


Fourth Semester



. (Regulation 2004)

Time: Three hours


PART A - (10 x 2 = 20 marks)

Maximum: 100 marks

1. Give the possible electronic transitions of methane and ethylene.

2. Calculate the optical path if a coloured complex which has molar absorptivity of 1480 shows an absorbance of 0.750 when its concentration is 0.0014 M.

3. Write the equations of the two chemical reactions involved in the quantitative determination of nitrite.

4. Which among the following gases is IR active? Why?

5. What is meant by molecular refractivity?

6. Write all the differences between AAS and FES.

7. Write the cell representation of the system used for the measurement of pH.

8. What is meant by an inert electrode?·

9. What are the developers used in the separation of the following mixtures?

(a) Mixture of Cu, Co and Ni.

(b) Mixture of amino acids.

10. What is the purpose of guard column in HPLC?

/

PART B - (5 x 16 = 80 marks)

11. (a) How is the quantitative analysis of the following carried out using visible spectrophotometer? (8 marks each)

(i) Iron in steel. (ii) Nitrite in water.

Or

(b) (i) Give the classification of all the instrumental methods based on their physical properties. (8)

(ii) With a diagram of a Duboscq colorimeter, briefly outline the method of quantitative analysis. (8)

12. (a) Using Woodward Fieser rules, calculate the absorption maxima for the following compounds.

(i)

CH=CH-CH=CH2

(8)

6. 7.

(ii)

Compound A & B

CH=CH-CH=CH2

Compound C & D.

'Or

CH=CH2

(8)

(b) Draw and explain spectrophotometric titration curves for the following

systems when (i) Titrant alone absorbs (6) (ii) Product of the reaction alone absorbs. (6)

(iii) The coloured analyte is converted into a non absorbing product by a colourless titrant. (4)

2

T8106

)

13. (a) Discuss in detail the theory, principle, instrumentation, interferences and applications of atomic absorption spectrophotometer. (16)

Or

(b) (i) With a diagram of a polarimeter, briefly discuss the various factors that affect the value of observed rotation in polarimetery. (8)

(ii) Explain the following in refractometery :

(1) Critical angle principle.

(2) Snell's law.

(3) Specific refraction.

(3)

(3)

(2)

14. (a) (i) With a diagram explain the construction of standard hydrogen

reference electrode and discuss its disadvantages. (8)

(ii) What are ion selective electrodes? Give the laboratory fabrication of any two ion selective electrodes. (8)

Or

(b) (i) Draw and explain the conductometric titration curves between: (8)

Strong acid and Weak base.

Mixture of strong and Weak acids versus strong base.

(ii) Derive Nernst equation and give its applications.

15. (a) (i) Give the classification of various chromatographic methods. (4)

(ii) Write the advantages of HPLC over GLC. (4)

(iii) How will you separate the mixture of coloured compounds using column chromatography? (8)

Or

(b) Discuss the principle, theory, instrumentation and applications of HPLC. (16)

3

T8106

(8)

)


FourthSer.nester



3

Tir.ne : Three hours


PART A - (10 x 2 = 20 r.narks)

Maxir.nurn: 100 r.narks

1. Does absorbance value indicate the fraction of light absorbed by the sar.nple?

2. Calculate the reduced r.nass of CN r.nolecule. Given the atomic weights of carbon = 12.011 and nitrogen = 14.0067 ar.nu.

3. Why is oxygen unsuitable as a carrier gas for GLC?

4. Methane does not absorb IR energy - why?

5. Filters are invariably used in absorption spectroscopy - why?

6. What is meant by development of chromatogram?

7. IR spectra is often characterized as r.nolecular finger prints - Justify the statement.

8. What is theromogravir.netric analysis?

9. Define electrode potential.

10. What is specific conductance?

PART B - (5 x 16 = 80 marks)

11. (a) (i) Calculate the optical density, if 10% of the incident' light is transr.nitted?

(ii) Most absorption bands in the visible UV spectra are very board. Give reasons.

(iii) Which of this CH3COCH3 and CH2= CHCOCH3 exhibits higher value of Amax in UV spectra?

(iv) State Bear's law.

Or

(4x4=16)

(b) (i) Name the sources for visible ultraviolet and infrared radiations. (6)

(ii) What are the limitation and advantages of instrumental methods of . analyse? (10)

12. (a) Explain the principle. of DTA with suitable example. Describe the block diagram of the apparatus and applications. (16)

Or

(b) (i) Describe the differences between DTA and DSC and write the application of DSC. (8)

(ii) Mention the applications of gas chromatography.

(8) 13. (a) Explain the various applications of atomic absorption spectroscopy. (16)

Or

(b) What is pH? How is the pH of an electrolyte determined with hydrogen electrode? (16)

14. (a) (i) Draw and explain the labeled diagram of calomel electrode. (8)

(ii) The utilized reflecting plane of lithium fluoride analyzing crystal has a d value of 2.014oA. Calculate the wavelength of second order diffracted line which has a value of 50.10• (8)

Or

(b) Describe the theory and applications of refractometry.

(16)

15. (a) Write an account on the estimation of concentration of a solution by colorimetry? (16)

Or

(b) Explain the qualitative and quantitative analysis ofTGA.

2

(16)

89089

)

IH 11551


Fourth Semester



Time: Three hours


PART A - (10 x 2 = 20 marks)

Maximum: 100 marks

1. Name any four instrumental parameters that affect the photometric accuracy.

2. Give any two examples of organic compounds each in which n ---) TC' and n ---) (7* transitions take place.

3. How inter and intra molecular hydrogen bonding are distinguished by IR spectroscopy?

4. Name any two sources and a detector used in the Mid-IR and Far-IR regions.

5. What are the different types of the sample holders generally used in thermogravimetric analysers?

6. What are ion selective electrodes? How IS the total potential of glass Ion selective electrode calculated?

7. What is single electrode potential and why it cannot be measured with a voltmeter?

8. Calculate the molar refraction of acetone if the refractive index n D of acetone is 1.3591 and the density is 0.7910 g cnr-' at 20 deg.C.

9. In what ways HPLC is superior to GC?

10. What are the two different developing reagents used for the identification of the mixture of Cu, Co and Ni and the mixture of amino acids?

)

PART B - (5'x 16 = 80 marks)

11. (i) What are the different regions of infra red spectrum and explain how the

different regions are useful in the qualitative analysis of an organic compound? (8)

(ii) Write short notes on sample preparation for recording IR spectra. (8)

12. (a) (i) Calculate the absorptivity of a compound with molecular weight

144, if 10-5 (g/ml) of solution exhibits absorbance of 0.4, when the optical path is 1 em. (6)

(ii) Derive Beer-Lambert's equation and discuss its real, chemical and

instrumental deviations. (10)

Or

(b) Write Woodward Fieser rules for dienes and calculate the Amax of the

following compounds.

(16)

CH=CH-CH=C~

8. 9. Compound A and B

H=CH-CH=CH2

Compound C and D

2

H 1155

I

13. (a) With a block diagram of an atomic absorption spectrophotometer, explain its principle, instrumentation, interferences and applications. (16)

Or

(b) (i) The concentration of cholestrol dissolved in chloroform is 6.15 g per 100 ml. A portion of this solution in a 5 cm polarimeter tube causes an observed rotation of -1.2 deg.

(1) Calculate the specific rotation of cholestrol.

(2) Predict the observed rotation if the same solution were placed in a 10 em polarimeter tube.

(3) Predict the observed rotation if 10 ml of the solution were diluted to 20 ml and placed in a 5 em polarimeter tube. (9)

(ii) Draw the diagram of Abbe's refractometer and explain how does it function. (7)

14. (a) (i) Draw and explain the conductometric titration curves of the following:

(1) Strong acid Vs. Weak base.

(2) Weak acid Vs. Strong base.

(8) (ii) Draw the diagram of a saturated calomel electrode indicating its

parts and write the Nernst equation for saturated calomel electrode. (8)

Or

(b) (i) With the thermogram of calcium oxalate dihydrate, discuss the principle and instrumentation and applications of thermogravimetric analyser. (8)

(ii) List all the factors that affect the shape of the thermogram of TGA. (8)

15. (a) Discuss the principle, instrumentation, qualitative and quantitative analyses and applications of gas chromatograph. (16)

Or

(b) With a block diagram of high performance liquid chromatograph, explain the principle, various elution methods, columns and detectors used, and applications. (16)

3

H 1155

IT 81061--j"


Fourth Semester



(Regulation 2004) Time: Three hours


PART A-CIO x 2 = 20 marks)

Maximum: 100 marks

1. Give the possible electronic transitions of methane and ethylene.

2. Calculate the optical path if a coloured complex which has molar absorptivity of 1480 shows an absorbance of 0.750 when its concentration is 0.0014 M.

3. Write the equations of the two chemical reactions involved in the quantitative determination of nitrite.

4. Which among the following gases is IR active? Why?

5. What is meant by molecular refractivity?

6. Write all the differences between AAS and FES.

7. Write the cell representation of the system used for the measurement of pH.

8. What is meant by an inert electrode?"

9. What are the developers used in the separation of the following mixtures?

(a) Mixture of Cu, Co and Ni.

(b) Mixture of amino acids.

10. What is the purpose of guard column in HPLC?

PART B - (5 x 16 = 80 marks)

11. (a) How is the quantitative analysis of the following carried out using visible spectrophotometer? (8 marks each)

(i) Iron in steel. (ii) Nitrite in water.

Or

(b) (i) Give the classification of all the instrumental methods based on their physical properties. (8)

(ii) With a diagram of a Duboscq colorimeter, briefly outline the method of quantitative analysis. (8)

12. (a) Using Woodward Fieser rules, calculate the absorption maxima for the following compounds.

(i)

CH=CH-CH=CH2

(8)

(ii)

Compound A & B

CH=CH-CH=CH2

Compound C & D.

'Or

(8)

(b) Draw and explain spectrophotometric titration curves for the following

systems when (i) Titrant alone absorbs (6) (ii) Product of the reaction alone absorbs. (6)

(ill) The coloured analyte is converted into a non absorbing product by a colourless titrant. (4)

2

T8106

13. (a) Discuss in detail the theory, principle, instrumentation, interferences and applications of atomic absorption spectrophotometer. (16)

Or

(b) (i) With a diagram of a polarimeter, briefly discuss the various factors that affect the value of observed rotation in polarimetery. (8)

37

(ii) Explain the following in refractometery :

(1) Critical angle principle.

(2) Snell's law.

(3) Specific refraction.

(3)

(3)

(2)

14. (a) (i) With a diagram explain the construction of standard hydrogen reference electrode and discuss its disadvantages. (8)

(ii) What are ion selective electrodes? Give the laboratory fabrication of any two ion selective electrodes. (8)

Or

(b) (i) Draw and explain the conductometric titration curves between: (8)

Strong acid and Weak base.

Mixture of strong and Weak acids versus strong base.

(ii) Derive Nernst equation and give its applications.

15. (a) (i) Give the classification of various chromatographic methods. (4) (ii) Write the advantages of HPLC over GLC. (4)

(iii) How will you separate the mixture of coloured compounds using column chromatography? (8)

Or

(b) Discuss the principle, theory, instrumentation and applications of HPLC. (16)

3

(8)

B.EIB.Tech. DEGREE EXAMINATION, MAY/JUNE 2006.

Fourth Semester



(Regulation - 2004) Time: Three hours

(Clarks Tables may be provided)

Answer ALL the questions.

PART A - (10 x 2 = 20 marks)

Maximum: 100 marks

1. Write the possible electronic transitions in any simple alkyl halide.

2. Find the % transmittance of the solution whose absorbance is 1.

3. Which among the following compounds absorbs visible light? Why?

(a) CH2 - (CH = CH)10 - CH2

(b) CH2 - CH = CH - CH2

(c) CH3 - (CH2)1O - CH3•

4. Draw the spectrophotometric titration curve when coloured substrate IS

converted to non absorbing product by a colourless titrant.

5. Calculate the molar refraction of acetone whose refractive index and density at 20 deg. Care 1.3591 and 0.791 gm/cm" respectively?

6. What are the factors that affect the value of observed rotation in polarimetry?

7. Write any four differences between redox and acid base reactions.

8. What are inert electrodes?

9. Why a guard column is used in HPLC? ,-- 10. Name the spraying agent and the eluent used in the separation of Cu, Co and

Ni in paper chromatography.

b-f3

PART B - (5 x 16 = 80 marks)

11. (i) Discuss about the quantitative analysis ofNi using Beer - Lambert's law. (8)

(ii) What are the various deviations generally observed in the quantitative analysis by spectrophotometry? (8)

12. (a) (i) Using Woodward Fieser rules, calculate the absorption maxima of the following compounds. (8)

HO

(ii) Calculate the absorptivity of a compound with molecular weight

144, if 10-5 (g/ml) of solution exhibits absorbance of 0.4 when the optical path is 1 cm. (8)

Or

(b) Discuss the applications ofUV and visible spectrophotometers. (16)

13. (a) With a schematic of a double beam spectrophotometer, discuss the various parts like source, optics and detectors. (16)

Or

(b)

14. (a)

Discuss the principle, technique and applications of AAS. (16)

\ (i) Draw and explain the conductometric titration curves between the following: (8)

(1) Weak acid and strong base.

(2) Strong acid and weak base.

(ii) With a diagram of standard hydrogen electrode, explain its functioning and the advantages of standard hydrogen electrode. (8)

(b) Explain :

(i) Single electrode potential

(ii) Liquid junction potential

(iii) Why single electrode potential cannot be measured with a voltmeter? (16) 15.

(a)

Discuss the principle, chromatograph.

instrumentation and applications of gas (16)

Or

(b)

(i)

Explain the principle chromatography.

and method involved in column (8)

(ii) How will you separate the mixture of amino acids using paper

chromatography? (8)

3

G-ICf

L 1051


Fourth Semester


CH 245 - INSTRUMENTAL METHODS OF ANALYSIS Time : Three hours


PART A- (10 x 2 = 20 marks)

Maximum: 100 marks

1. Name any four instrumental parameters that affect the photometric accuracy.

2. Give any two examples of organic compounds each in which n ~ 7r. and n ~ ()". transitions take place.

3. How inter and intra molecular hydrogen bonding are distinguished by. IR spectroscopy?

4. Name any two sources and a detector used in the Mid-IR and Far-IR regions.

5. What are the different types of the sample holders generally used in thermogravimetric analysers?

6. What are ion selective electrodes? How IS the total potential of glass ion selective electrode calculated?

7. What is single electrode potential and why it cannot be measured with a voltmeter?

8. Calculate the molar refraction of acetone if the refractive index n D of acetone is 1.3591 and the density is 0.7910 g cm-3 at 20 deg.C.

9. In what ways HPLC is superior to GC?

10. What are the two different developing reagents used for the identification of the mixture of Cu, Co and Ni and the mixture of amino acids?

o

PART B - (5 x 16 = 80 marks)

11. (i) What are the different regions of infra red spectrum and explain how the

different regions are useful in the qualitative analysis of an organic compound? (8)

(ii) Write short notes on sample preparation for recording IR spectra. (8)

12. (a) (i) Calculate the absorptivity of a compound with molecular weight

144, if 10-5 (g/ml) of solution exhibits absorbance of 0.4, when the optical path is 1 em. (6)

(ii) Derive Beer-Lambert's equation and discuss its real, chemical and

instrumental deviations. (10)

Or

(b) Write Woodward Fieser rules for dienes and calculate the Amax of the

following compounds.

(16)

CH=CH-CH=C~

10. 11. Compound A a'hel-B

H=CH-CH=CH2

Compound C and D

2

H 1155

::

13. (a) With a block diagram of an atomic absorption spectrophotometer, explain its principle, instrumentation, interferences and applications. (16)

Or

(b) (i) The concentration of cholestrol dissolved in chloroform is 6.15 g per 100 ml. A portion of this solution in a 5 em polarimeter tube causes an observed rotation of -1.2 deg.

(1) Calculate the specific rotation of cholestrol.

(2) Predict the observed rotation if the same solution were placed in a 10 em polarimeter tube.

(3) Predict the observed rotation if 10 ml of the solution were diluted to 20 ml and placed in a 5 em polarimeter tube. (9)

(ii) Draw the diagram of Abbe's refractometer and explain how does it function. (7) 14. (a) (i)

Draw and explain the conductometric titration curves of the following:

(1) Strong acid Vs. Weak base.

(2) Weak acid Vs. Strong base.

(8) (ii) Draw the diagram of a saturated calomel electrode indicating its

parts and write the Nernst equation for saturated calomel electrode. (8)

Or

(b) (i) With the thermogram of calcium oxalate dihydrate, discuss the principle and instrumentasion and applications of thermogravimetric analyser. (8)

(ii) List all the factors that affect the shape of the thermogram of TGA. (8)

15. (a) Discuss the principle, instrumentation, qualitative and quantitative analyses and applications of gas chromatograph. (16)

Or

(b) With a block diagram of high performance liquid chromatograph, explain the principle, various elution methods, columns and detectors used, and applications. (16)

I B 234 I B.EIB.Tech. DEGREE EXAMINATION, NOVEMBERIDECEMBER 2005.

Fourth Semester



/p~

Time: Three hours


PART A - (10 x 2 = 20 marks)

1. What is atomic spectroscopy?

Maximum: 100 marks

2. Give the relationship between wavelength and energy of electromagnetic

radiation.


4. What is Fermi resonance?

5. Write any two applications of IR spectroscopy.

6. Write any two applications of refractometry.

7. Define standard electrode potential.

8. Give two examples of reference electrodes.

9. What is X ray diffraction?

10. What are the classification of chromatography methods?

PART B - (5 x 16 = 80 marks)

11. (i) Draw a decomposition curve of calcium oxalate monohydrate.

(ii) Discuss the principle of DTA and mention its application.

(iii) What is the principle TGA and mention its application.

(iv) Differentiate between DSC and DTA. (4 x 4 = 16)

12.

(a)

Discuss the importance characteristics electromagnetic radiation.

and various ranges of (8 + 8)

Or

(b) CO What is the principle involved in Duboseq colourimetry.

(ii) Explain briefly about Nesslerimetry.

(8)

(8) 13. (a) Write the principle of UV spectroscopy and discuss in detail the

instrumentation and the quantitative analysis of organic compounds and inorganic compounds using UV spectroscopy. (4 + 4 + 8)

Or (b) Write the principle of AAS and discuss the various types of interferences

in AAS. (4 +12)

14. (a) (i) Write the principles of polarimetry and explain its applications. (4 + 4)

(ii) Write a note on ion selective electrodes.

(8)

Or (b) What is electrolyte conductivity and explain the principles and methods

of strong and weak acidlbase titrations using conductometry. (4 +12)

15. (a) Discuss the principles and applications of X-ray diffraction and explain the working of X-ray diffractometer with neat diagram. (4 + 4 + 8)

Or (b) Discuss the principles and applications of HPLC and explain the various

characteristics of detectors used in HPLC. (4 + 4 + 8)

B234 2

I R 117 I B.E./B.Tech. DEGREE EXAMINATION, APRIUMAY 2005.

Fourth Semester


CH 245 - INSTRUMENTAL METHODS OF ANALYSIS Time: Three hours


PART A - (10 x 2 = 20 marks)

1. Define electromagnetic wave.

2. What are the applications of UV-spectroscopy?


Maximum: 100 marks

4. What is the essential requirement for a solvent to be used in UV-spectroscopy?




8. What are the classifications of chromatographic method?

9.Write the applications of DTA.

10. Name various X-ray detectors.

PART B - (5 x 16 = 80 marks)

11. (i) Give the reasons for the deviation of Beer's law.

(ii) Show the thermogram of copper sulphate penta hydrate (CuS045H20)

(iii) Distinguish between DSC and DTA.

(iv) . Discuss the detectors used in HPLC. (4 x 4 = 16)

12. (a) (i) Discuss the important characteristics of electromagnetic radiation. (8)

(ii) Explain briefly about Nesslerimetry.

Or

(8)

(b) What is IR-spectroscopy? Discuss the source, important parts and

detectors of IR-spectroscopy. (16)


Or


14. (a) Write a note on :

(i) Ion selective electrodes.

(ii) Saturated calomel electrodes.

Or

(8)

(8)

(b)

Explain the principle, potentiometry.

experimental setup and applications of (16)

15. (a) Explain the principle, instrumentation and applications of thermo gravimetry. (16)

Or

(b) Discuss the principle, instrumentation and applications of GC. (16)

2

R117

I H 231 I B.E./B.Tech. DEGREE EXAMINATION, APRIUMAY 2004.

Fourth Semester




PART A- (10 x 2 = 20 marks)

Maximum: 100 marks

1. What is the relation between wave lengh, frequency and wave number?

2. Write a note on fermi resonance.

3. Why methanol is a good solvent for uv and not for IR determination?

4. Define the term: Bathochromic shift.

5. What is a chromophore?

6. Why is hydrogen electrode not used generally in pH measurement?

7. What is a electrochemical all?

8. What are the advantages of conductometric titrations?

9. What is differential thermal analysis?

10. What is chromatography?

PAR}' B - (5 x 16 = 80 marks)

11. (i) Mention the application of uv spectroscopy.

(ii) What are the differences between DTA and DSC?

(iii)

Calculate the Amax based on Woodward. compounds.

CH-CH=CH2

6 Fieser rule for the fallowing

(1)

(2)

(iv) What are absorption laws? (4 x 4 = 16)

12. (a) Explain in detail the chemistry of electronic spectroscopy. (16)

(b) What are the factors which fluence the position of absorption frequency from their normal values in IR spectroscopy? (16)

13. (a) Outline the method of separation of organic compounds in a mixture using a gas chromatograph. (16)

Or

(b) Describe the block diagram of DTA and gives its applications.

14. (a) Explain the principle and measurement of optical activity using the polarimeter. (16)

Or

(b) Describe a glass electrode. How can it be used for determining the pH of a solution? (16)

15. (a) Discuss the titration curves obtained in the conductometric titration of

(i) A strong acid with a strong base.

(ii) A strong acid with a weak base. (2 x 8 = 16)

Or

(b) Explain the applications of atomic absorption spectroscopy. (16)

2 H231

----------------------------------------------------------------------~/


Fourth Semester



Answer ALL the questions.

PART A - (10 x 2 = 20 marks)

Maximum: 100 marks

1. Calculate the absorbance of a solution whose transmittance is 10%.

2. Write the two chemical equations involved in the quantitative determination of nitrite by spectrophotometer.

3. Explain bathochromic shift with an example.

4. Write the advantages of double beam spectrophotometer over single beam spectrophotometer.

5. What are the sequential events taking place in the flame of atomic absorption spectrophotometer when the sample is introduced?

6. What are the factors that change the value of angle of rotation in polarimetry?

7. Why absolute single electrode potential cannot be measured with the help of a voltmeter?

8. Define Mosley's law.

9. What are the applications of Differential Scanning Calorimeter?

10. Explain the terms R, and R; and write the relationship between Ru and R, with reference to high performance liquid chromatography.

11. (i)

PART B - (5 x 16 = 80 marks)

How will you do multi component analysis spectrophotometer.

using UV -Vis (10)

(ii) Write all the Wood Ward Fieser rules used for the calculation of

absorption maxima for dienes and trienes. (6)

12. (a) (i) Derive Beer-Lamberts equation and explain the deviations observed in the quantitative analysis. (8)

(ii) How will you determine iron using visible spectrophotometer? (8)

Or

(b) (i) With a neat diagram explain the function of anyone detector used in UV or Vis spectrophotometers, (8)

(ii) Give short notes about the sample preparation in Infra red spectrophotometry. (8)

13. (a) Discuss the principle, instrumentation, interferences and applications of atomic absorption spectrophotometer. (16)

Or

(b) Explain the principle, technique and applications of Polarimetry with a neat diagram of a polarimeter. (16)

14. (a) (i) Write the differences between redox and acid-base reactions. (8)

(ii) Briefly discuss about any two reference electrodes. (8)

Or

(b) Draw the experimental set up for the measurement of pH and explain the construction, cell representation, advantages and disadvantages of glass electrode. (16)

15. (a) Discuss the technique of thermogravimetric analysis and explain the factors that affect the shape of the thermogram. (16)

Or

(b) (i) Discuss the principle, Instrumentation and applications of gas chromatograph. (10)

(ii) How will you separate the mixture of Cu, Co and Ni using paper chromatography? (6)

2

N 1029

I D·292 I B.E./B.Tech. DEGREE EXAMINATION, APRIIlMAY 2003.

Fourth Semester




PART A - (10 x 2 = 20 marks)

1. What is meant by electromagnetic radiation?


Maximum: 100 marks



5. Define specific refractometry and molecular refractivity.

6. Write any two applications of polarimetry.




10. Write the important requirements of a carrier gas in gas chromatograph.

PART B - (5 x 16 = 80 marks)

11. Write a note on the following:

(i) Sources of radiation and detectors in UV spectroscopy.

(ill) Ion selective electrodes.

(iv) Reference electrodes.

(4x4= 16)

12. (a) (i) Limitations and deviations of Beer-Lambert's law. (ii) Explain briefly Duboscq calorimetry with neat diagram.

(8)

(8)

Or (b) (i) What is IR spectroscopy? Explain the different region of IR. (8)

(ii)

Discuss the source, important parts and detectors spectroscopy.

of IR (8)


Or


14. (a) Explain the measurement of PH by potentiometry and discuss the advantages. (16)

Or (b) (i) What is X-ray diffraction? (4)

(ii) How X-rays are produced and detected by X-ray diffraction? (12) 15. (a) Write a note on

(i) Thermometric method of analysis and its applications.

(ii) Differential thermal analysis and its applications.

Or

(8)

(8)

(b) Discuss briefly the principle, apparatus used and its working and

advantages of HPLC. (16)

I G224 I B.E./B.Tech. DEGREE EXAMINATION, NOVEMBERIDECEMBER 2003.

Fourth Semester



Answer ALL questions. PART A - (10 x 2 = 20 marks)

Maximum: 100 marks

1. Give the relationship between wavelength· and energy of electromagnetic

radiation.


3. What are the reasons for the deviation of Beer's law?

4. Why water is not a good solvent for IR spectroscopy?

5. Write the applications ofUV-spectroscopy.

6. Write important advantages of photometric titrations.

7. Write any two reference electrodes.

8. Define standard electrode potential.


10. What are the characteristics of detectors are used in HPLC?

PART B - (5 x 16 = 80 marks)

11. (i) Write a note on the following sampling techniques used in IR spectroscopy.

(ii) Thermogram of calcium oxalate monohydrate.

(iii) Various X-ray detectors.

(iv) Gas chromatography.

(4x4= 16)

~':'~~::;~::"~:,(a) (i) Discuss the important characteristics of electromagnetic radiations. (8)

" • J ;"', (ii) Explain briefly Duboscq calorimetry with neat diagram. (8)

Or

(b) What is UV-spectroscopy? Discuss the source, important parts and detectors of UV-spectroscopy. (16)

13, (a) Explain the principle, instrumentation and applications of AAS. (16)

Or

(b) Explain the principle, instrumentation and applications of polarimetry. (16)

14. (a) Write a note on :

(i) Saturated calomel electrode

(ii) Standard hydrogen electrode.

Or

(2 x 8 = 16)

(b) Discuss the principle experimental set up and various titrations of

conductometry. (16)

15. (a) Explain the principle, instrumentation and applications of differential thermal analysis. (16)

Or (b) Discuss the principle instrumentation and applications of HPLC.

(16)

Reg. No. :

B.E./B.Tech. DEGREE EXAMINATION, NOVEMBER/DECEMBER 2010

Fourth Semester


CH 2252 — INSTRUMENTAL METHODS OF ANALYSIS

(Regulation 2008)

Time : Three hours Maximum : 100 Marks

Answer ALL questions

PART A — (10 × 2 = 20 Marks)

1. What are Auxochromes?

2. What is the principle used in colorimetry?

3. Define pH.

4. Explain the principle of Amperometric titrations.

5. Define Mosley’s law.

6. Draw the thermogram of O5HCuSO 24 ⋅ .

7. Explain the principle of Refractometry.

8. Differentiate between Atomic emission and absorption Spectroscopies.

9. What is meant by Rf in chromatography?

10. Differentiate between HPLC and GC.

PART B — (5 × 16 = 80 Marks)

11. (a) Explain Woodward-Fischer rules for the calculation of absorption

maxima for dienes and carbonyl compounds. (16)

Or

(b) (i) Define Beer-Lambert’s law. (8)

(ii) Explain Photometric titration in detail. (8)

Question Paper Code : 53086

219

219

219

53086 2

12. (a) Discuss the main features of potentiometric titration along with

instrumentation, types, advantages and applications. (16)

Or

(b) (i) Explain the conductometric titrations in detail. (8)

(ii) Explain Ion selective electrodes (8)

13. (a) Discuss the principle, instrumentation and applications of Differential

Scanning Calorimetry in detail. (16)

Or

(b) Explain XRD in detail. (16)

14. (a) How is Atomic Absorption Spectroscopy useful in determining metal ion

concentration? Discuss in detail. (16)

Or

(b) Write notes on the following :

(i) Turbidimetry (8)

(ii) Polarimetry. (8)

15. (a) (i) How do you separate organic compounds by thin layer

chromatography? Explain. (8)

(ii) Distinguish between column and gas chromatographies. (8)

Or

(b) Explain, in detail, the separation of amino acids and mixture of Cu, Co

and Ni by paper chromatography. (16)

———————

219

219

219

d 292 - vidyarthiplus

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