N Nexsus

Environmental Science and Green Chemistry — Major (End Semester) 2026 question paper

MMMUT Mechanical Engineering previous year question paper for Environmental Science and Green Chemistry (BSM-140), semester 1, Major (End Semester) 2026. 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) 2026
  • Questions: 24

Questions asked in Environmental Science and Green Chemistry Major (End Semester) 2026

  1. Q1 a). Define Ionization Potential and Electronegativity. Describe their trends across a period in the periodic table. [2 marks]
  2. Q1 b). Draw the Molecular orbital diagram for NO molecule. Also discuss the bond Order of NO⁺ molecule. [2 marks]
  3. Q1 c). What is nucleophilic substitution reaction? Explain the mechanism of SN1 reaction. [2 marks]
  4. Q1 d). Explain the mechanism Of Hofmann rearrangement. [2 marks]
  5. Q1 e). Calculate the pH and the hydrogen ion and hydroxide ion [OH-] concentrations Of a 3.2x10⁻³ M solution of Ba(OH)₂ in water at 25°C. [2 marks]
  6. Q1 f). Explain the phenomenon of temperature inversion in the atmospheric layers. [2 marks]
  7. Q1 g). Write a short note on Acid rain and its harmful effects On environment and human health. [2 marks]
  8. Q2 a). Explain any three of the following terms: (l) (i) Absorbance (ii) Transmittance (iii) Beer-Lambert Law (iv) Chromophore (v) Auxochrome (II) Discuss the various types of electronic transitions when a molecule absorbs UV radiation. [5 marks]
  9. Q2 b). i) Write the principle Of IR spectroscopy. Explain the factors that affect vibrational frequencies. ii) Calculate the number of fundamental modes Of vibration for the following molecules: H₂0, N₂0, and C0₂. [5 marks]
  10. Q2 c). (i) Explain the types of vibration in I R spectroscopy. (ii) Give the applications Of IR spectroscopy [5 marks]
  11. Q3 a). Answer the following [5 marks]
  12. Q3 b). Write the synthesis and uses or any three of the following polymers: i) PMMA (ii) PVC (iii) Buna-S (iv) PET (v) Nylon-6.6 [5 marks]
  13. Q3 c). Discuss the classification polymers in detail. [5 marks]
  14. Q4 a). Write a short note on Green solvents. By giving the example, write any three reactions which may occur in green solvent. [5 marks]
  15. Q4 b). Write the twelve principles of green chemistry and their importance in modern chemistry synthesis. [5 marks]
  16. Q4 c). Write a note on "Advantage of using green solvents overorganic solvents". OR Explain how green chemistry contribute to sustainable development. [5 marks]
  17. Q5 a). Explain microwave heating in green chemistry. Also write its advantages over conventional heating methods. Give two examples or reactions facilitated by microwave heating. [5 marks]
  18. Q5 b). Explain the use Of ultrasound for organic transformation in green chemistry. Also write about its advantages over conventional heating methods. Give two examples of reactions facilitated by microwave heating. [5 marks]
  19. Q5 c). Discuss the role Of green reagents in sustainable chemical processes. Discuss any two green reagents used in organic synthesis with examples Of reaction where they may be applied. [5 marks]
  20. QQ1). Attempt any Five parts of the following.
  21. QQ2). Attempt any Two parts Of the following.
  22. QQ3). Attempt any two parts of the following.
  23. QQ4). Attempt any Two parts of the following.
  24. QQ5). Attempt any Two parts of the following.