Engineering Chemistry Unit 3 – Electrochemistry, Batteries, Corrosion and Engineering Materials: AKTU previous year questions
44 AKTU questions from Unit 3 (Electrochemistry, Batteries, Corrosion and Engineering Materials) asked in 2021–2026, tagged by marks, year and topic. In short: about 25 marks of every paper come from this unit; the most asked topic is Corrosion (15 times); 32 questions came back in a later year. The latest ones are listed below; on the page you can filter them by 2-mark or long questions, topic and repeats.
Unit 3 previous year questions
- What is Plaster of Paris (POP)? Write its chemical formula. (2 marks, 2026, Cement)
- Explain the working of a Galvanic cell with a neat diagram. Also derive the expression for equilibrium constant K from cell EMF. (7 marks, 2026, Basic Electrochemistry Concepts)
- Explain the mechanism of wet corrosion of iron with the help of electrochemical theory. What are the factors affecting the rate of corrosion? (7 marks, 2026, Corrosion)
- Explain the setting and hardening of cement with relevant chemical reactions. What is the role of water in this process? (7 marks, 2026, Cement)
- Why does part of a nail inside the wood under goes corrosion explain it? (2 marks, 2025, Corrosion)
- Can corrosion occur in the vacuum of space? If so, under what conditions? (2 marks, 2025, Corrosion)
- A dry cell battery loses charge even when not in use. What fundamental chemical processes lead to its slow degradation? (2 marks, 2025, Batteries and Cells)
- Explain why a pure metal rod half immersed vertically in water starts corroding at the bottom. (7 marks, 2025, Corrosion)
- Discuss the construction and chemistry of charging/discharging of Lead Acid battery. (7 marks, 2025, Batteries and Cells)
- 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, 2025, Cement)
- What are the constituents of cement? Discuss its manufacturing process with the mechanism of setting and hardening of cement. (7 marks, 2025, Cement)
- Brass exposed to seawater loses zinc over time, leaving behind a copper-rich structure. Explain the underlying electrochemical process. (7 marks, 2025, Corrosion)
Most asked Unit 3 topics
- Corrosion – asked 15 times
- Basic Electrochemistry Concepts – asked 9 times
- Cement – asked 8 times
Unit 3 question pattern
- 2-mark questions: 15 asked in 2021–2026
- 7-mark questions: 20 asked in 2021–2026
- 10-mark questions: 9 asked in 2021–2026
- About 25 marks from Unit 3 in every paper
- 32 questions were asked again in a later year
Unit 3 questions year by year
- 2026: 4 Unit 3 questions asked (23 marks across that year's papers)
- 2025: 8 Unit 3 questions asked (41 marks across that year's papers)
- 2024: 9 Unit 3 questions asked (48 marks across that year's papers)
- 2023: 8 Unit 3 questions asked (46 marks across that year's papers)
- 2022: 10 Unit 3 questions asked (68 marks across that year's papers)
- 2021: 5 Unit 3 questions asked (34 marks across that year's papers)