B. Sc. Life Science (Chemistry) Semester 3 Previous Year Question Papers
All Semester 3 subjects for B. Sc. Life Science (Chemistry) at Delhi University — 7 subjects, 33 previous year question papers from 2022–2026. Open any subject to view or download the original PDF papers by year.
Paper types this semester: DSC, DSE.
This semester carries 6 discipline elective (DSE) subjects and 1 core (DSC) subject. Each subject below links to its own page with every available previous year paper — filter by year, then open or download the PDF directly.
Core papers (DSC)
Discipline electives (DSE)
- Chem-DSE-1: Chemistry of Major and Minor Biogenic Elements1 paper
- Chem-DSE-11: Chemistry of Polymers, Dyes and Natural Products5 papers
- Chem-DSE-14: Industrial Chemicals and Environment3 papers
- Chem-DSE-2: Polynuclear Hydrocarbons, Pharmaceutical Compounds, UV- Visible & IR Spectroscopy5 papers
- Chem-DSE-3: Chemistry of Colloids and Adsorption2 papers
- Chem-DSE-7: Analytical Methods in Chemistry6 papers
Sample questions from B. Sc. Life Science (Chemistry) Semester 3 papers
- Chem-DSE-1: Chemistry of Major and Minor Biogenic Elements (2025)
Chemistry of Major and Minor Biogenic Elements l. (a) Discuss the relationship between exchange pair of electrons and exchange energy With an example.
- Chem-DSE-11: Chemistry of Polymers, Dyes and Natural Products (2026)
Attempt Four question in all. Q.4 (a) Discuss special isoprene rule. Classify the following terpenes into mono-, sesqui- and di-terpenes:
- Chem-DSE-2: Polynuclear Hydrocarbons, Pharmaceutical Compounds, UV- Visible & IR Spectroscopy (2024)
Give the stepwise synthesis of anthracene using phthalic anhydride. (3) Pharmaceutical Compounds,
- Chem-DSE-3: Chemistry of Colloids and Adsorption (2026)
a) Explain, why the surface tension of a solvent is not modified to a large extent in the presence of surface-inactive substances.
- Chem-DSE-7: Analytical Methods in Chemistry (2026)
Define resolution (Rs) and derive its expression. Two peaks have retention time 5 min and 6 min with peak widths 0.5 min each.
- Chemical Energetics and Equilibria (DSC-7, Chemistry-03) (2026)
The questions should be numbered in accordance to the number in the question paper. Values of constant :
Tools for Semester 3
- SGPA CalculatorWork out this semester's SGPA from your marks
- Exam KitPlan revision across all 7 subjects this semester
- DU Semester 3 Exam Guide: Second-Year Preparation StrategyA targeted preparation guide for Delhi University second-year students facing Semester 3 exams — handling advanced DSCs, choosing DSEs, and managing increased difficulty.
Frequently asked questions
- Where can I find B. Sc. Life Science (Chemistry) Semester 3 previous year question papers?
- This page lists all 7 Semester 3 subjects of B. Sc. Life Science (Chemistry) with 33 question papers from 2022–2026. Open a subject to view or download the PDFs.
- How many subjects are in B. Sc. Life Science (Chemistry) Semester 3?
- 7 subjects have question papers listed for B. Sc. Life Science (Chemistry) Semester 3.