AKTU Engineering Chemistry · Important Questions 2026Source: ryzenstudy.com PYQs
BAS102 Engineering Chemistry Important Questions 2026 (AKTU)
Repeat analysis + most-asked questions, unit-wise
What we did: built from all 9 AKTU Engineering Chemistry papers (2021-22 (Sem 1)–2025-26): 207 questions grouped into 115 distinct questions, 38 of which were asked in more than one paper.
- of marks were repeat questions
- 49%
- of marks were repeat questions
- questions asked in 2+ papers
- 38
- questions asked in 2+ papers
- papers analysed (2021-22 (Sem 1)–2025-26)
- 9
- papers analysed (2021-22 (Sem 1)–2025-26)
- units, mapped to current syllabus
- 5
- units, mapped to current syllabus
How much of the paper repeats?
- Repeats are real: when we checked each newer BAS102 paper against the papers before it, on average 49% of its marks were questions already asked in an earlier paper.
- 2022-23 (Sem 1) paper: 17% of marks were repeats (2 of 3 repeated questions were in our top list).
- 2022-23 (Sem 2) paper: 38% of marks were repeats (4 of 8 repeated questions were in our top list).
- 2023-24 (Sem 1) paper: 54% of marks were repeats (8 of 11 repeated questions were in our top list).
- 2023-24 (Sem 2) paper: 78% of marks were repeats (11 of 16 repeated questions were in our top list).
- 2024-25 (Sem 1) paper: 13% of marks were repeats (3 of 3 repeated questions were in our top list).
- 2024-25 (Sem 2) paper: 59% of marks were repeats (8 of 12 repeated questions were in our top list).
- 2025-26 paper: 83% of marks were repeats (11 of 22 repeated questions were in our top list).
- Topic weightage is a guide, not a guarantee: our Tier 1 + Tier 2 topics covered 68% of the next paper's marks — picking the same number of topics at random would have covered about 51%.
Across 10 subjects and 23 papers we tested, 43% of marks repeated earlier questions on average.
1.Unit-wise most-asked questions
Ranked by how many papers asked them, then by how recently. Click a paper to open it.
Unit 1: Chemistry of Advanced Materials
20% of past marks| Question | Asked |
|---|---|
| What are Liquid Crystals? Describe the types of liquid crystals. Explain nematic, smectic, and cholesteric liquid crystals with suitable diagrams and examples | Asked 6× |
| Draw and explain the molecular orbital energy level diagrams of homonuclear diatomic molecules such as N₂ and O₂. Predict their bond order and magnetic behavior | Asked 5× |
| What is fullerene? Explain its structure and one important application | Asked 3× |
| Illustrate any five principles of Green Chemistry and give the green synthesis method for preparation of Paracetamol. | Asked 3× |
Unit 2: Stereochemistry
19% of past marks| Question | Asked |
|---|---|
| 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. | Asked 3× |
| Why is Tetramethylsilane 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. | Asked 3× |
| CH₃CH₂OH Explain the number of signals, splitting patterns (multiplicity), and integration for each type of proton | Asked 2× |
| Explain the elementary idea of IR spectroscopy. Analyze how different functional groups are identified using IR spectra. Which of the following molecules will show IR absorption spectra and why? H₂, HCl, CO₂, H₂O, CH₄, N₂ | Asked 2× |
Unit 3: Corrosion · Chemistry of Engineering Materials
18% of past marks| Question | Asked |
|---|---|
| Discuss the construction and chemistry of charging/discharging of Lead Acid battery. | Asked 5× |
| 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 | Asked 4× |
| What are the constituents of cement? Discuss its manufacturing process with the mechanism of setting and hardening of cement. | Asked 3× |
| Explain the hardening and setting process of cement. Discuss the chemical reactions involved, difference between initial and final setting, and factors affecting setting time | Asked 2× |
Unit 4: Fuels and Combustion
21% of past marks| Question | Asked |
|---|---|
| Write the different chemical reactions taking place in soda-lime process. A sample of water on analysis give following result: Analysis of Raw water: Ca+2 = 80 mg/l; Mg+2 = 24 mg/l, CO2 = 33 mg/l, HCO-1 = 132 mg/l, H+ = 10 mg/l & NaCl 4.3 ppm, OH-1 = 34 mg/l. Calculate the Quantity of lime (74% pure) and soda (92% pure) needed for softening 50000 L of water | Asked 5× |
| Define the Higher Calorific Value (HCV) and Lower Calorific Value (LCV) of a fuel sample. In a bomb calorimeter experiment, the following data were obtained: Weight of coal = 0.896g, Weight of water in calorimeter = 2590g, Water equivalent of calorimeter = 3500g, Rise in temperature of water = 2.592°C, Cooling correction = 0.040°C, Acid correction = 50cal, Fuse wire correction = 20cal, If the fuel contains 6% hydrogen, calculate its LCV, assuming the latent heat of steam = 580 cal/g | Asked 5× |
| Explain when will the value of G.C.V. = N.C.V.? | Asked 3× |
| 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 | Asked 3× |
Unit 5: Organometallic Compounds
22% of past marks| Question | Asked |
|---|---|
| What are organo metallic compounds? Discuss the preparation of Grignard Reagent. Predict the final product obtained when C2H5MgBr reacts with (i)HCHO (ii) CH3CHO (iii) (CH3)2 CO? | Asked 8× |
| Nylon-6,6 (Polyamide) | Asked 4× |
| Why can thermosetting polymers not be reshaped upon heating, while thermoplastic polymers can? | Asked 3× |
| Classify the conducting polymers and explain its different types also. Mention its applications also | Asked 3× |
2.Topic weightage: which topics carry the marks
Blue = Tier 1 + Tier 2 (topics that carried ~80% of past marks). Grey = the rest. It shows where marks have gone, not a promise of what comes next.
NMR spectroscopy: elementary idea · U2
6.5% (cum 7%)
Types and causes of corrosion · U3
5.7% (cum 12%)
Water softening: lime-soda and zeolite · U4
5.4% (cum 18%)
Preparation of organometallic compounds · U5
4.8% (cum 22%)
UV spectroscopy: basics and applications · U2
4.5% (cum 27%)
Bomb calorimeter and Dulong's method · U4
4.4% (cum 31%)
Conducting and biodegradable polymers · U5
4.3% (cum 36%)
Liquid crystals: types and applications · U1
4% (cum 40%)
Kevlar, Dacron, Nylon and Buna · U5
3.7% (cum 43%)
Bond order and magnetic character · U1
3.7% (cum 47%)
Basic concepts of electrochemistry · U3
3.4% (cum 50%)
Proximate and ultimate coal analysis · U4
3.1% (cum 54%)
Molecular orbitals of diatomic molecules · U1
3.1% (cum 57%)
IR spectroscopy and applications · U2
3% (cum 60%)
Secondary cells: lead acid battery · U3
3% (cum 63%)
Optical isomerism without chiral carbon · U2
2.9% (cum 66%)
Cement: constituents and manufacturing · U3
2.8% (cum 68%)
Graphite and fullerene structure · U1
2.8% (cum 71%)
Teflon, Lucite and Bakelite · U5
2.7% (cum 74%)
Nanomaterials: preparation and characteristics · U1
2.3% (cum 76%)
Green chemistry: 12 principles · U1
2.2% (cum 78%)
Polymerization processes · U5
2.1% (cum 80%)
Boiler troubles · U4
2.1% (cum 83%)
Ion exchange and reverse osmosis · U4
1.7% (cum 84%)
Green synthesis of adipic acid and paracetamol · U1
1.7% (cum 86%)
Thermoplastic and thermosetting polymers · U5
1.5% (cum 87%)
Corrosion prevention and control · U3
1.3% (cum 89%)
Classification and characteristics of fuels · U4
1.3% (cum 90%)
Hardening and setting of cement · U3
1.2% (cum 91%)
Applications of RMgX and LiAlH4 · U5
1.2% (cum 92%)
Polymer blends and composites · U5
1.1% (cum 94%)
Chiral drugs · U2
1% (cum 95%)
Gross and net calorific value · U4
1% (cum 96%)
Numerical problems in spectroscopy · U2
0.9% (cum 96%)
Biogas from organic waste · U4
0.7% (cum 97%)
Determination of hardness and alkalinity · U4
0.7% (cum 98%)
Carbon nanotubes (CNT) · U1
0.6% (cum 98%)
Sources, impurities and hardness of water · U4
0.6% (cum 99%)
Primary cells: dry cell · U3
0.3% (cum 99%)
Classification of polymers · U5
0.3% (cum 100%)
Plaster of Paris (POP) · U3
0.3% (cum 100%)
| Topic | Papers | Share |
|---|---|---|
| NMR spectroscopy: elementary idea · Unit 2 · Tier 1 | 8/9 | 6.5% |
| Types and causes of corrosion · Unit 3 · Tier 1 | 8/9 | 5.7% |
| Water softening: lime-soda and zeolite · Unit 4 · Tier 1 | 7/9 | 5.4% |
| Preparation of organometallic compounds · Unit 5 · Tier 1 | 8/9 | 4.8% |
| UV spectroscopy: basics and applications · Unit 2 · Tier 1 | 6/9 | 4.5% |
| Bomb calorimeter and Dulong's method · Unit 4 · Tier 1 | 6/9 | 4.4% |
| Conducting and biodegradable polymers · Unit 5 · Tier 1 | 7/9 | 4.3% |
| Liquid crystals: types and applications · Unit 1 · Tier 1 | 7/9 | 4% |
| Kevlar, Dacron, Nylon and Buna · Unit 5 · Tier 1 | 6/9 | 3.7% |
| Bond order and magnetic character · Unit 1 · Tier 1 | 6/9 | 3.7% |
| Basic concepts of electrochemistry · Unit 3 · Tier 1 | 7/9 | 3.4% |
| Proximate and ultimate coal analysis · Unit 4 · Tier 2 | 5/9 | 3.1% |
| Molecular orbitals of diatomic molecules · Unit 1 · Tier 2 | 6/9 | 3.1% |
| IR spectroscopy and applications · Unit 2 · Tier 2 | 6/9 | 3% |
| Secondary cells: lead acid battery · Unit 3 · Tier 2 | 5/9 | 3% |
| Optical isomerism without chiral carbon · Unit 2 · Tier 2 | 5/9 | 2.9% |
| Cement: constituents and manufacturing · Unit 3 · Tier 2 | 4/9 | 2.8% |
| Graphite and fullerene structure · Unit 1 · Tier 2 | 4/9 | 2.8% |
| Teflon, Lucite and Bakelite · Unit 5 · Tier 2 | 4/9 | 2.7% |
| Nanomaterials: preparation and characteristics · Unit 1 · Tier 2 | 5/9 | 2.3% |
| Green chemistry: 12 principles · Unit 1 · Tier 2 | 3/9 | 2.2% |
| Polymerization processes · Unit 5 · Tier 2 | 4/9 | 2.1% |
| Boiler troubles · Unit 4 · Tier 3 | 5/9 | 2.1% |
| Ion exchange and reverse osmosis · Unit 4 · Tier 3 | 3/9 | 1.7% |
| Green synthesis of adipic acid and paracetamol · Unit 1 · Tier 3 | 3/9 | 1.7% |
| Thermoplastic and thermosetting polymers · Unit 5 · Tier 3 | 3/9 | 1.5% |
| Corrosion prevention and control · Unit 3 · Tier 3 | 2/9 | 1.3% |
| Classification and characteristics of fuels · Unit 4 · Tier 3 | 1/9 | 1.3% |
| Hardening and setting of cement · Unit 3 · Tier 3 | 2/9 | 1.2% |
| Applications of RMgX and LiAlH4 · Unit 5 · Tier 3 | 2/9 | 1.2% |
| Polymer blends and composites · Unit 5 · Tier 3 | 3/9 | 1.1% |
| Chiral drugs · Unit 2 · Tier 3 | 2/9 | 1% |
| Gross and net calorific value · Unit 4 · Tier 3 | 3/9 | 1% |
| Numerical problems in spectroscopy · Unit 2 · Tier 3 | 3/9 | 0.9% |
| Biogas from organic waste · Unit 4 · Tier 3 | 1/9 | 0.7% |
| Determination of hardness and alkalinity · Unit 4 · Tier 3 | 2/9 | 0.7% |
| Carbon nanotubes (CNT) · Unit 1 · Tier 3 | 1/9 | 0.6% |
| Sources, impurities and hardness of water · Unit 4 · Tier 3 | 2/9 | 0.6% |
| Primary cells: dry cell · Unit 3 · Tier 3 | 1/9 | 0.3% |
| Classification of polymers · Unit 5 · Tier 3 | 1/9 | 0.3% |
| Plaster of Paris (POP) · Unit 3 · Tier 3 | 1/9 | 0.3% |
3.Paper pattern (2025-26)
| Section | Questions | Rule |
|---|---|---|
| A | 7 × 2 marks | Attempt all |
| B | 6 × 7 marks | Attempt any 3 |
| C | 14 × 7 marks | Attempt any 1 |
4.In the syllabus, never asked yet
Low priority, but read them once — a new paper can always start here.
- Industrially important liquid crystals · U1
- Environmental impact of green chemistry · U1
- Geometrical isomerism · U2
- Classification of batteries · U3
- Corrosion in specific industries · U3
- Speciality polymers · U5
5.Study order
- 1NMR spectroscopy: elementary idea (Unit 2, Tier 1)
- 2Types and causes of corrosion (Unit 3, Tier 1)
- 3Water softening: lime-soda and zeolite (Unit 4, Tier 1)
- 4Preparation of organometallic compounds (Unit 5, Tier 1)
- 5UV spectroscopy: basics and applications (Unit 2, Tier 1)
- 6Bomb calorimeter and Dulong's method (Unit 4, Tier 1)
- 7Conducting and biodegradable polymers (Unit 5, Tier 1)
- 8Liquid crystals: types and applications (Unit 1, Tier 1)
- 9Kevlar, Dacron, Nylon and Buna (Unit 5, Tier 1)
- 10Bond order and magnetic character (Unit 1, Tier 1)
- 11Basic concepts of electrochemistry (Unit 3, Tier 1)
- 12Proximate and ultimate coal analysis (Unit 4, Tier 2)
- 13Molecular orbitals of diatomic molecules (Unit 1, Tier 2)
- 14IR spectroscopy and applications (Unit 2, Tier 2)
- 15Secondary cells: lead acid battery (Unit 3, Tier 2)
- 16Optical isomerism without chiral carbon (Unit 2, Tier 2)
- 17Cement: constituents and manufacturing (Unit 3, Tier 2)
- 18Graphite and fullerene structure (Unit 1, Tier 2)
- 19Teflon, Lucite and Bakelite (Unit 5, Tier 2)
- 20Nanomaterials: preparation and characteristics (Unit 1, Tier 2)
- 21Green chemistry: 12 principles (Unit 1, Tier 2)
- 22Polymerization processes (Unit 5, Tier 2)
FAQ
Which units of BAS102 carry the most marks?
Unit 5 (Organometallic Compounds, 22% of past marks) and Unit 4 (Fuels and Combustion, 21% of past marks).
Do AKTU Engineering Chemistry questions repeat?
Yes. On average 49% of the marks in each newer BAS102 paper came from questions already asked in an earlier paper, and 38 questions have appeared in more than one paper.
How is this list made?
Every question from the 9 papers (2021-22 (Sem 1)–2025-26) was mapped to the current AKTU syllabus and grouped with the same question from other years. Questions are ranked by how many papers they appeared in, then by how recently.
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Note: this is based on past AKTU papers, not a guarantee. Questions are mapped to the current syllabus; topics that are no longer in the syllabus are left out.