Engineering Chemistry PYQ 2023-24 AKTU Question Paper

AKTU · BTECH · Semester 1, 2 · Engineering Chemistry · Session 2023-24 · PYQ

AKTU Engineering Chemistry previous year question paper 2023-24 for B.Tech Semester 1/2. Covers Atomic Structure, Advanced Materials and Green Chemistry…

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Engineering Chemistry AKTU syllabus

  1. Unit 1: Atomic Structure, Advanced Materials and Green Chemistry
  2. Unit 2: Spectroscopic Techniques and Stereochemistry
  3. Unit 3: Electrochemistry, Batteries, Corrosion and Engineering Materials
  4. Unit 4: Water Technology and Fuels
  5. Unit 5: Polymers and Organometallic Compounds

Questions in Engineering Chemistry AKTU PYQ 2023-24

  1. Q1a. Compare and arrange the following in the increasing order of stability: O2, O2+, O2- (2 marks, 2023-24)
  2. Q1a. Explain molecular self-assembly method for preparing the nanomaterials. (2 marks, 2023-24)
  3. Q1b. How nanomaterials are different from bulk materials? (2 marks, 2023-24)
  4. Q1b. A solution shows a transmittance of 20%, when kept in a cell of 2.5 cm thickness. Calculate its concentration if the molar absorptivity coefficient is 12000dm³mol⁻¹cm⁻¹. (2 marks, 2023-24)
  5. Q1c. What is the selection rule for the molecule to show NMR spectrum? (2 marks, 2023-24)
  6. Q1c. Analyze the effect of polar solvent on π → π* transition in acetone. (2 marks, 2023-24)
  7. Q1d. Explain, which one will exhibit higher value of λmax in UV/Visible spectra of CH3COCH3 and CH2=CHCOCH3. (2 marks, 2023-24)
  8. Q1d. Calculate the emf of the cell, if the standard emf of the cell is 1.54 V. Write cell reaction also. Zn(s)|Zn²⁺(0.2M)||Ag⁺(0.002M)|Ag(s) at 25°C (2 marks, 2023-24)
  9. Q1e. Calculate the EMF of the Daniel cell at 25°C when the concentration of ZnSO4 and CuSO4 are 0.001M and 0.01M respectively. The standard potential of the cell is 1.1 Volt. (2 marks, 2023-24)
  10. Q1e. What is role of Gypsum in cement manufacturing? (2 marks, 2023-24)
  11. Q1f. Show with the help of reactions, how scale formation can be prevented by Calgon conditioning? (2 marks, 2023-24)
  12. Q1f. A sample of coal contains 60% Carbon, 33% Oxygen, 6.0% Hydrogen, 0.5% Sulphur, 0.2% Nitrogen and 0.3% Ash. Calculate its GCV. (2 marks, 2023-24)
  13. Q1g. Classify polymers on the basis of tacticity (stereochemistry). (2 marks, 2023-24)
  14. Q1g. What do you understand by Polymer Blends? (2 marks, 2023-24)
  15. Q2a. What are the Anisotropic crystals? How it is classified on the basis of temperature? Also give important applications. (7 marks, 2023-24)
  16. Q2a. Draw molecular orbital diagram of O₂ and NO. Calculate their bond order and comment on their magnetic behaviors. (7 marks, 2023-24)
  17. Q2b. Explain the Absorption and Intensity shift in the UV spectroscopy and support with examples. Illustrate, the effect of polar and non-polar solvent on π - π* transition in acetone? (7 marks, 2023-24)
  18. Q2b. Illustrate the shielding and Deshielding effect involved in NMR spectroscopy. In the P-NMR spectrum recorded at 293 K, an Organic compound (C₃H₇NO) exhibited signals at δ 7.8 (1H, singlet), δ 2.8 (3H, singlet) and δ 2.6 (3H, singlet). Find the structure of compound. (7 marks, 2023-24)
  19. Q2c. Explain the mechanism of Hydrogen evolution and Oxygen absorption with the help of electrochemical theory of corrosion. Explain noble and sacrificial metallic coatings for preventing corrosion. (7 marks, 2023-24)
  20. Q2c. Illustrate the various steps involved during manufacturing of Portland cement with the help of a labelled diagram. Give the chemical reactions involved during setting and hardening of cement. (7 marks, 2023-24)
  21. Q2d. Illustrate the principle and working of the Zeolite process. A zeolite softener was regenerated by passing 50L of NaCl solution having strength of 40% of NaCl. Calculate the hardness of water if 10000L of hard water was softened by using this zeolite. (7 marks, 2023-24)
  22. Q2d. Compare merits and demerits of Zeolite and Ion Exchange method. (7 marks, 2023-24)
  23. Q2e. Illustrate the preparation of Grignard Reagents and predict the final product obtained when C2H5MgBr react with (i) HCHO (ii) CH3CHO (iii) (CH3)2CO. (7 marks, 2023-24)
  24. Q2e. Discuss the preparation of Grignard Reagent. Predict the final product obtained when C₂H₅MgBr reacts with (i) HCHO (ii) CH₃CHO (iii) (CH₃)₂CO (iv) CO₂ (7 marks, 2023-24)
  25. Q3a. Draw the molecular orbital diagram of NO and N2 molecules. Calculate their bond order and predicts their magnetic behavior. (7 marks, 2023-24)
  26. Q3a. Illustrate any five principles of Green Chemistry and the give green synthesis method for preparation of Paracetamol. (7 marks, 2023-24)
  27. Q3b. Discuss any FOUR principles of Green Chemistry. Explain the conventional and Green route synthesis of paracetamol. (7 marks, 2023-24)
  28. Q3b. Classify Liquid crystals on the basis of temperature and give their applications in various fields. (7 marks, 2023-24)
  29. Q4a. Comment on any TWO of the following: (i) Lambert-Beer's Law (ii) Molecular vibration (iii) Shielding and de-shielding effect. (7 marks, 2023-24)
  30. Q4a. Asymmetrically substituted compounds having even number of cumulative double bonds exhibit optical isomerism whereas compounds having odd number of cumulative double bonds exhibit geometrical isomerism. Explain giving proper reasons. (7 marks, 2023-24)
  31. Q4b. (i) Why Tetra Methyl Silane is used as an internal indicator in NMR spectroscopy? A compound have molecular formula C10H14. The H1 NMR spectra of the molecule gave the following data: A: δ 1.30 (9H, singlet); δ 7.28 (5H, singlet). Giving reasons deduce the structures for the molecule. (ii) How… (7 marks, 2023-24)
  32. Q4b. Write short notes on (any TWO) (i) UV Shift (ii) Applications of IR spectroscopy (iii) Molecular vibration (7 marks, 2023-24)
  33. Q5a. Differentiate between primary and Secondary batteries? Discuss the various reactions involve during the charging and discharging of lead storage battery. (7 marks, 2023-24)
  34. Q5a. Illustrate the working, diagrammatic representation and cell reaction of Lead Acid storage battery during charging and discharging. (7 marks, 2023-24)
  35. Q5b. Describe the various steps involved during Portland cement manufacture by rotary kiln method. Explain the setting and hardening of cement with relevant chemical reactions involved. (7 marks, 2023-24)
  36. Q5b. Briefly explain wet corrosion. How corrosion can be prevented by Metallic coating and using corrosion inhibitors? (7 marks, 2023-24)
  37. Q6a. Explain the principle of water softening by lime – soda process. Calculate the amount lime and soda required for 100,000 L of water containing the following salt: Mg2+= 48 ppm, Ca2+ = 120ppm, FeSO4.7H2O = 139 ppm, CO2=88ppm, NaNO3 = 8.9ppm, HCO3- = 122 ppm. (7 marks, 2023-24)
  38. Q6a. With the help of a neat diagram, explain the working of Bomb calorimeter. A sample of coal contain C=89%, H=8% and ash=3%. The following data were obtained when the above coal was tested in bomb calorimeter: Weight of coal burnt= 0.85 g; Weight of water taken= 850 g; Water equivalent of bomb and… (7 marks, 2023-24)
  39. Q6b. With the help of a neat diagram, explain the working of Bomb calorimeter. A sample of coal contain C=91%, H=6%, N=2% and ash=1%. The following data were obtained when the above coal was tested in bomb calorimeter: Weight of coal burnt= 0.97 g, Weight of water taken= 800 g, Water equivalent of bomb… (7 marks, 2023-24)
  40. Q6b. Illustrate the principle of lime soda process. Analysis of raw water gives the following data: Ca²⁺ = 20 ppm, Mg²⁺ = 25 ppm, CO₂ = 30 ppm, HCO₃⁻ = 150 ppm, K⁺ = 10 ppm. Analysis of treated water: CO₃²⁻ = 45ppm, OH⁻ = 68 ppm. Calculate the Lime (87% pure) and Soda (91% pure) required to soften 10⁶… (7 marks, 2023-24)

AKTU paper codes: BAS102, BAS202, KAS102, KAS202

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