Engineering Chemistry PYQ 2024-25 AKTU Question Paper

AKTU · BTECH · Semester 1, 2 · Engineering Chemistry · Session 2024-25 · PYQ

AKTU Engineering Chemistry previous year question paper 2024-25 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 2024-25

  1. Q1a. Arrange the following molecules or ions in increasing order of bond length. O2, O2++ & O2-2 (2 marks, 2024-25)
  2. Q1a. Is it possible to achieve 100% waste-free chemical manufacturing? If not, what are the limitations? (2 marks, 2024-25)
  3. Q1b. How many NMR signals are expected in each of the following compounds – CH3CH2CH2Br, CH3OCH3 (2 marks, 2024-25)
  4. Q1b. Why do some cholesteric liquid crystals reflect only certain wavelengths of light while others do not? (2 marks, 2024-25)
  5. Q1c. Why does part of a nail inside the wood under goes corrosion explain it? (2 marks, 2024-25)
  6. Q1c. Can a molecule be chiral in one environment but achiral in another? Provide a theoretical example. (2 marks, 2024-25)
  7. Q1d. Why zeolite softener is not recommended for obtaining feed water for high pressure boilers? (2 marks, 2024-25)
  8. Q1d. Can corrosion occur in the vacuum of space? If so, under what conditions? (2 marks, 2024-25)
  9. Q1e. Ethan (C2H6) not forms polymer but ethene (C2H4) forms polymer why? (2 marks, 2024-25)
  10. Q1e. A dry cell battery loses charge even when not in use. What fundamental chemical processes lead to its slow degradation? (2 marks, 2024-25)
  11. Q1f. F2 is diamagnetic while O2 is paramagnetic, how? (2 marks, 2024-25)
  12. Q1f. Which type of water contamination- chemical or microbial- is more difficult to remove? Justify your answer. (2 marks, 2024-25)
  13. Q1g. Calculate the hardness of water sample containing impurity of Ca(HCO3)2 81 mg/l. Give your answer in °F also. (2 marks, 2024-25)
  14. Q1g. Why can thermosetting polymers not be reshaped upon heating, while thermoplastic polymers can? (2 marks, 2024-25)
  15. Q2a. Show the molecular orbital's of HF molecule and calculate the bond order. (7 marks, 2024-25)
  16. Q2a. If a bulk material is optically transparent, will its nanomaterial counterpart also be transparent? Justify with an example. (7 marks, 2024-25)
  17. Q2b. Among H2, HCl, CO2, H2O molecules identify which will be IR active and why? Explain the different type of vibrations observed in CO2. (7 marks, 2024-25)
  18. Q2b. Two enantiomers of a drug have different half-lives in the body. Explain the biochemical basis for this phenomenon. (7 marks, 2024-25)
  19. Q2c. Explain why a pure metal rod half immersed vertically in water starts corroding at the bottom. (7 marks, 2024-25)
  20. Q2c. How can the 12 Principles of Green Chemistry be applied to cement production to reduce environmental impact? (7 marks, 2024-25)
  21. Q2d. Explain the Lime–Soda process of water softening. What are the advantages and limitations of this process? Calculate the amount of lime and soda required for the treatment of 10,000 litres of water whose analysis is as follows (in mg/L): Mg(HCO3)2=73; CaSO4=102; MgCl2=95; MgSO4=24;… (7 marks, 2024-25)
  22. Q2d. Why is natural gas preferred over coal for power generation, even though coal is more abundant? Two coal samples have identical fixed carbon content but different volatile matter percentages. How will this affect their combustion properties? (7 marks, 2024-25)
  23. Q2e. What is conducting polymer? Which conducting polymer is generally use in electronic touch screen. Give the Advantages and limitations of conducting polymers. (7 marks, 2024-25)
  24. Q2e. Discuss the primary degradation mechanisms that affect polymer stability in different environmental conditions. (7 marks, 2024-25)
  25. Q3a. Illustrate any five principles of Green Chemistry and the give green synthesis method for preparation of Paracetamol. (7 marks, 2024-25)
  26. Q3a. A hypothetical molecule X2 has a bond order of 2.5. Propose possible charge states or electronic configurations for this molecule. (7 marks, 2024-25)
  27. Q3b. A XY2 molecule has a bond order of 2.5. Propose possible energy level diagram with electronic configurations for this molecule, also explain its magnetic character also. (7 marks, 2024-25)
  28. Q3b. Given that paracetamol can be synthesized via both conventional and green routes, what challenges exist in fully replacing the conventional method with the green method? (7 marks, 2024-25)
  29. Q4a. Asymmetrically substituted compounds having even number of cumulative double bonds exhibit optical isomerism whereas compounds having odd number of double bonds exhibit geometrical isomerism. Explain giving proper reasons. (7 marks, 2024-25)
  30. Q4a. How can a combination of UV, IR, and NMR spectroscopy be used to determine the structure of an unknown organic compound? Illustrate with an example. (7 marks, 2024-25)
  31. Q4b. Why Tetra Methyl Silane is used as reference in NMR spectroscopy? Give the number of 1H NMR signals and their splitting pattern in the following compounds: (i) (CH3)3COCH3 (ii) CH3CH(Cl)CH2Cl (iii) CH3COOH (iv) C6H5OH. (7 marks, 2024-25)
  32. Q4b. A compound has the molecular formula C₄H₈O₂. It shows a singlet at 3.8 ppm and a quartet at 1.2 ppm in its ¹H NMR spectrum. Predict its structure and justify your answer. (7 marks, 2024-25)
  33. Q5a. Discuss the construction and chemistry of charging/discharging of Lead Acid battery. (7 marks, 2024-25)
  34. Q5a. Why does Portland cement contain both tri-calcium aluminate and di-calcium silicate, even though their hydration rates are vastly different? The hydration of cement releases heat, yet adding excess water weakens concrete. Explain the paradox. (7 marks, 2024-25)
  35. Q5b. What are the constituents of cement? Discuss its manufacturing process with the mechanism of setting and hardening of cement. (7 marks, 2024-25)
  36. Q5b. Brass exposed to seawater loses zinc over time, leaving behind a copper-rich structure. Explain the underlying electrochemical process. (7 marks, 2024-25)
  37. Q6a. Explain the different parameters that are determined in the proximate analysis of coal. On burning 0.92g of a solid fuel in a bomb calorimeter, the temperature of 3300g of water increased by 2.42°C. Water equivalent of calorimeter and latent heat of steam are 385.0g and 587.0cal/g, respectively.… (7 marks, 2024-25)
  38. Q6a. Why is the Zeolite process unsuitable for water containing high concentrations of iron and manganese? A 500 L water sample requires 50 mL of 0.01 M EDTA to completely react with its calcium and magnesium ions. Calculate the total hardness in ppm as CaCO3. (7 marks, 2024-25)
  39. Q6b. How are scales formed in boilers? Discuss four disadvantages of scale formation in the boilers. The hardness of 10,000 litres of water sample was removed by passing it through a zeolite softener. The zeolite softener then required 200 litres of sodium chloride solution containing 200 g/L of NaCl… (7 marks, 2024-25)
  40. Q6b. i. Can hydrogen be classified as both a primary fuel and a secondary fuel? Justify your answer. ii. A fuel with a GCV of 35 MJ/kg has an NCV of 32 MJ/kg. Explain why there is a difference and how to calculate it. (7 marks, 2024-25)

AKTU paper codes: BAS102, BAS202, KAS102, KAS202

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