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ENGINEERING CHEMISTRY II QUESTION BANK UNIT I 1. What is an irreversible cell? Explain the irreversibility taking a suitable example. 1.45 2. Explain the principle involved in conductometric titrations. Give an experimental procedure for the titration between a strong acid and a strong base conductometrically. 1.46||||||| 3. Explain the principle involved in potentiometric titrations. Write an experimental procedure for carrying out the titration of a redox reaction. 1.51-1.54||||Fe 2+ 4. What is EMF? How can it be measured potetiometrically? 1.30 |||| 5. What are reference electrodes? Describe calomel electrode with a neat diagram. 1.14 & 1.16|||||| 6. Explain the measurement of pH of a solution using glass electrode. Mention two advantages of this electrode. 1.20| (Pg. I 27 also)|||| 7. Derive Nernst equation. 1.6|||||| 8. Describe Standard Hydrogen Electrode with a diagram. What are limitations? 1.14| 9. Differentiate reversible and irreversible cells. Illustrate with examples 1.45 -1.46| 10. Discuss electrode potential. Describe how electrode potential is measured 1.23 11. With example explain metal-metal ion electrode 1.4 – 1.8 12. Describe the importance of electrode potential 1.23 – 1.25 13. Write a short note on electrochemical cells. 1.27| UNIT II 1. Explain chemical corrosion. Also explain the intensity of corrosion varying with the nature of oxide layer formation over metal. 2.3 2. What is paint? What are the constituents of paint and their functions? What are the requisites of a good paint?3.1 ||||||| 3. What is differential aeration corrosion? Write its mechanism. Give any illustrations that show differential corrosion. 2.13||||

CY2161 Engineering Chemistry – II Question Bank

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Page 1: CY2161 Engineering Chemistry – II Question Bank

ENGINEERING CHEMISTRY II QUESTION BANKUNIT I

1. What is an irreversible cell? Explain the irreversibility taking a suitable example. 1.452. Explain the principle involved in conductometric titrations. Give an experimental procedure

for the titration between a strong acid and a strong base conductometrically. 1.46|||||||3. Explain the principle involved in potentiometric titrations. Write an experimental procedure

for carrying out the titration of a redox reaction. 1.51-1.54||||Fe2+

4. What is EMF? How can it be measured potetiometrically? 1.30 ||||5. What are reference electrodes? Describe calomel electrode with a neat diagram. 1.14 &

1.16||||||6. Explain the measurement of pH of a solution using glass electrode. Mention two advantages

of this electrode. 1.20| (Pg. I 27 also)||||7. Derive Nernst equation. 1.6||||||8. Describe Standard Hydrogen Electrode with a diagram. What are limitations? 1.14|9. Differentiate reversible and irreversible cells. Illustrate with examples 1.45 -1.46|10. Discuss electrode potential. Describe how electrode potential is measured 1.2311. With example explain metal-metal ion electrode 1.4 – 1.812. Describe the importance of electrode potential 1.23 – 1.2513. Write a short note on electrochemical cells. 1.27|

UNIT II1. Explain chemical corrosion. Also explain the intensity of corrosion varying with the nature of

oxide layer formation over metal. 2.32. What is paint? What are the constituents of paint and their functions? What are the

requisites of a good paint?3.1 |||||||3. What is differential aeration corrosion? Write its mechanism. Give any illustrations that

show differential corrosion. 2.13||||4. Discuss the various types of metallic coatings explaining the method of coatings (including

gold plating). 3.9(Refer I 53 also) ||||||5. What is electroless plating? Write a short note on electroless nickel plating and discuss its

applications. 3.12 ||||6. Explain inhibition of corrosion by sacrificial anodic protection and impressed current

cathodic methods, 2.25 ||||||||7. Corrosion control techniques 2.22 – 2.278. Discuss the mechanism of drying of oil plant. 3.59. Explain the factors influencing corrosion. 2.18||||||10. Explain in detail the mechanism of electrochemical corrosion. 2.8-2.11||||11. Explain the concept of Galvanic corrosion2.12 – 2.1312. Discuss corrosions formed due to stress I 3513. What are corrosion inhibitors? Classify different types of inhibitors with examples.2.29 –

2.31

14. Write a short note on the following |a. Pitting corrosion b. Waterline corrosion

Page 2: CY2161 Engineering Chemistry – II Question Bank

c. Stress corrosion d. Microbial corrosion

15. Objectives of electroplating and different characteristics of electro deposit?3.1016. Distinguish between chemical and electrochemical corrosion 2.11 – 2.12

UNIT III1. What is proximate analysis? Write it’s significance.4.2||||2. What is synthetic petrol? How is it manufactured by Bergius process?4.25 ||||3. What is flue gas analysis? How is it carried out by Orsat’s process and mention the

precautions to be followed during the analysis. 5.36 |||||||4. What are LPG and CNG? Discuss the advantages of LPG over gaseous fuel and CNG over LPG.

4.33 & 4.34|5. How is coke manufactured by Otto Hoffman method? List out by-products. 4.12 ||||6. How will you obtain synthetic petrol by Fischer – Tropsch process? 4.12||||||7. What is cracked gasoline? How is it obtained? 4.19 - 4.21(What is meant by cracking of

petroleum? Explain fluidized-bed catalytic method of obtaining gasoline. Give its mechanism )||

8. What is refining? Explain the different fractions obtained from crude oil when it is subjected to refining (or) Draw the flow chart and tabulate the petroleum refining 4.16 – 4.19||

9. How is water gas manufactured? Give its uses10. Explain the significance of ultimate analysis of coal 4.1611. Write in detail chemical reactions involved in the manufacture of producer gas and mention

its chemical composition 4.36|12. Explain polymeric method to produce synthetic petrol 8.24 – 8.2713. What is meant by knocking? How is it related o chemical constitution? Explain octane

number. 4.29 – 4.3114. How do analyze the coal? What are the factors to be considered to analyze coal? What are

the advantages of ultimate analysis over proximate analysis of coal? I 78 & 4.1015. What is cracking? What are its types? Explain moving bed catalytic cracking process in detail

4.19, 4.23-4.24 I 79UNIT IV

1. Explain the lead silver system with the necessary phase diagram (or)With the help of a neat phase diagram describe lead-silver eutectic system and write its applications(or) Draw a neat sketch for two component (lead silver) system and explain. 6.15|||||||||||(along with Write short notes on one component and two component systems)

Applications of Eutectic mixturea. Low melting alloy are used in safety devices ( as plugs in automobiles ), fire-sprikles

and as ‘fail safe’ device in boilersb. It is also used in preparing solders, used for joining two metal pieces together

2. State phase rule. Explain the terms involved in it with the required examples. 6.1||3. How the properties of metals are improved by alloy formation?7.24. What is condensed phase rule? Explain the thermal analysis of solid solution. 6.10 & 6.12|5. Draw a neat labeled phase diagram of water system and explain areas, curves and triple

point in it 6.7 |||||||6. Discuss the composition characteristics and uses of non ferrous alloy as bronze. 7.16

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7. Write a note on heat treatment of steels. 7.5, 6.15 ||||||8. State Gibbs Phase rule. Explain the terms involved in it.6.19. Explain how phase rule is applicable in one component system. 6.710. List the properties of non-ferrous alloys. Give the composition of any two non-ferrous alloys.

7.14|||11. Draw the cooling curves of pure substances and mixture and explain thermal analysis. 6.1212. What are alloys? Write the chemical composition and uses of (1) heat treatable stainless

steel and (2) non heat treatable stainless steel 7.1 & 7.11 – 7.13|13. Explain the constituents of nichrome and stainless steel. 7.10 – 7.1314. State about the phase rule for chemical reaction equilibrium 6.1 – 6.615. Illustrate how phase diagrams are drawn from thermal analysis data with example 3.15|16. Determine P and C and calculate F for the decomposition of CaCO3 in a closed vessel. (I48) 17. What are alloys? Write the purpose of making alloys. 7.1 – 7.318. What is nichrome and give its composition and uses 7.10 – 7.1119. Bring out the composition, properties and uses of copper alloys. 7.16 – 7.1820. What are alloy steels? Why is there a need for alloying steels? What are its applications? I

80,7.3-7.5UNIT V

1. How is sodium estimated by flame photometry? 8.19|||||||||2. Derive mathematical form of Beer Lambert’s law. At definite wavelength, an absorber when

placed in a cell of 1 cm path length absorbs 20% of the incident light. If the absorptivity of the absorber at this wavelength is 2.0, find out its concentration.8.4 & 8.9|

3. Explain the electronic transitions caused by energy absorbed in the UV region .8.234. Discuss in detail about atomic absorption spectroscopy with a neat block diagram. 8.55|5. Explain the principles and determination of iron by calorimetry. 8.13|||6. Explain the principle instrumentation, working and application of UV Visible Spectroscopy.

8.21|||||7. How is nickel estimated by atomic absorption spectroscopy? Explain the principle and

instrumentation and block diagram.8.55 - 5.58|||||||8. Explain the principle, instrumentation and application of IR spectroscopy with block diagram.

8.38||||9. Derive Beer Lambert’s law. State its disadvantages and applications. 8.4||10. Give the possible stretching and bending vibrations of the following (a). CO2 (b).H2O(c). –CH2

8.46 – 8.4411. Compare flame photometry and atomic absorption spectroscopy. Q.No.34 Pg No. H10 |12. Give the block diagram of a colorimeter. Show how colorimetry is used for the estimation of

concentration of a solution 8.11 – 8.3313. Explain the mechanism of interaction between the vibrating molecule and the Infra-Red

radiation 8.39

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PROBLEMSUNIT I

1. Calculate the EMF of the following galvanic cell. The standard reduction potential of zinc and copper electrodes are -0.76V and +0.34V respectively for Zn/Zn2+ [0.1]/Cu2+ [0.01]/Cu. (1.37)

2. Construct a galvanic cell and represent the cell equations and find out the feasibility of the cell. Given standard reduction potential of Zn2+ /Zn(0.01M)=0.76 V and Cu2+/Cu (0.1M)=0.34 V (problem no. 13 pg 1.44)

3. The EMF of a cell measured by means of hydrogen electrode against a saturated calomel electrode at 298 K is 0.4188V. If the pressure of the H2 (g) was maintained at 1 atm, calculate the pH of the unknown solution given the potential of reference calomel electrode is 0.2415V (I 46 q. 11 a ii)

4. Calculate the EMF of the following cell Zn|Zn2+ (0.1 M)||Ag+ (0.1 M)|Ag E0cell =1.56 V 1.39

5. Calculate the reduction potential for the reduction of O2 at pH=7. I 716. The standard reduction potential of Cu is 0.34V and the concentration of Cu2+ ion is 0.015M

finda. Reduction electrode potential of Cu;b. Free energy change of electrode reaction. I 77

UNIT III1. Calculate the volume of air required for the complete combustion if 1m3 of the gaseous fuel

having the following composition by volume: H2 =50% CH4 =36% N2 =1.5% CO=6% C2H4 =4% H2O Vapour=2.5% 5.33

2. Calculate the total air required for the complete combustion of a gaseous fuel which gives the following composition H2=48% CH4=35% CO=15% N2=2% 5.24

3. A sample of coal was found to contain the following C=81% H=4% O=2% N=10% N=10% S=2% and the remaining being ash. Estimate the quantity of minimum air required for the complete combustion of 3 kg of the sample. 5.21

4. Calculate the minimum amount of air required for complete combustion of air required for complete combustion of 50 kg of fuel containing 80% C,6% H,2% S and the rest nitrogen by weight. 5.26

5. On analysis a coal sample has the following compositions; C=85% H=8% S=1% N=2% ash =4%. Calculate the Gross and net calorific values of coal.(Latent heat of Steam =587 cal/gm) 5.4

UNIT V1. A solution of thickness 2 cm transmitted 40% incident light. Calculate the concentration of

this solution given that the molar absorptivity is 6000 dm3 mol-1 cm-1