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Environmental Science and Green Chemistry — Major (End Semester) 2024 question paper

MMMUT Mechanical Engineering previous year question paper for Environmental Science and Green Chemistry (BSM-140), semester 1, Major (End Semester) 2024. All 24 questions are listed below, each with a written answer on Nexsus.

Paper details

  • Subject: Environmental Science and Green Chemistry (BSM-140)
  • Branch: Mechanical Engineering
  • Semester: 1
  • Exam: Major (End Semester) 2024
  • Questions: 24

Questions asked in Environmental Science and Green Chemistry Major (End Semester) 2024

  1. Q1. Attempt any Five parts of the following.
  2. Q1(a). How does atomic radius vary across a period and down a group? Explain with examples Describe the trends in atomic radius and the factors influencing these changes [2 marks]
  3. Q1(b). Draw the MO diagram of CO molecule and determine the bond order of CO^+ molecule. [2 marks]
  4. Q1(c). Explain the following: i) HF has higher boiling point then HCI ii) p-nitrophenol is more soluble in water than o-nitrophenol [2 marks]
  5. Q1(d). Explain the mechanism of Beckmann Rearrangement [2 marks]
  6. Q1(e). Write a short note on acid rain and its harmful effects. [2 marks]
  7. Q1(f). Explain the principle of Lime-Soda process. Give the chemical reactions taking place during the softening of water with this process. [2 marks]
  8. Q1(g). Write a short note on the main impurities present in water and their effects. [2 marks]
  9. Q2. Attempt any Two parts of the following
  10. Q2(a). Explain the principle of UV-Visible spectroscopy. Describe various applications of this technique. [5 marks]
  11. Q2(b). Describe various types of vibrations taking place in a molecule. Draw the fundamental modes of vibrations for H₂O molecule. [5 marks]
  12. Q2(c). Explain the following terms (Any five) i) Triplet state, ii) Intersystem crossing, ii) Absorbance iv) Shielding and de-shielding v) Chemical Shift, vi) Internal Conversion vii) Vibrational Relaxation [5 marks]
  13. Q3. Attempt any Two parts of the following
  14. Q3(a). Predict the number of signals that will be observed in them HNMR spectrum of the following compounds: [5 marks]
  15. Q3(b). What are bio-degradable polymers? Give the synthesis of any two bio-degradable polymers. OR Write a short note on the problems posed by the use of nonbiodegradable polymers. [5 marks]
  16. Q3(c). Write an explanatory note on the incineration and its use for the disposal of polymeric waste. [5 marks]
  17. Q4. Attempt any Two parts of the following
  18. Q4(a). Explain the 12 principles of green chemistry and their importance in modern chemical practices [5 marks]
  19. Q4(b). Explain the importance of green solvents in chemical reactions. How do they contribute to eco-friendly chemical processes? Give two examples of green solvents and reactions. [5 marks]
  20. Q4(c). Compare traditional chemical synthesis pathways with green chemical synthesis pathways. Highlight the differences in terms of efficiency, waste production, and environmental impact with the help of two examples of industrial chemicals [5 marks]
  21. Q5. Attempt any Two parts of the following
  22. Q5(a). What is microwave heating in green chemistry? Explain its advantages over conventional heating methods. Give two examples of reactions facilitated by microwave heating. [5 marks]
  23. Q5(b). Illustrate the use of ultrasound technique in green chemistry methodologies. How does it improve reaction efficiency? Give two examples of reactions facilitated by ultrasound. [5 marks]
  24. Q5(c). Discuss the role of green reagents in sustainable chemical processes. Provide two examples of commonly used green reagents [5 marks]