Explore: All JEE Main chapters · JEE Main Chemistry PYQs · JEE Main hub · JEE Main 2026 · Syllabus & pattern
Answer first
Some Basic Concepts in Chemistry PYQs (previous year questions) for JEE Main: Some Basic Concepts in Chemistry (Chemistry) had 15 questions across the 11 official JEE Main papers we tagged (2016–2026), and appeared in 11 of them. Asked in 3 of 3 years. The concepts asked in the most papers: Mole Concept, Stoichiometry, Environmental Chemistry.
Year-wise question count
Asked in 3 of 3 years.
| Year | Papers | Questions | Per paper |
|---|---|---|---|
| JEE Main 2026 | 9 | 9 | 1 |
| JEE Main 2017 | 1 | 3 | 3 |
| JEE Main 2016 | 1 | 3 | 3 |
Most-asked concepts
Sorted by the number of papers a concept appeared in.
| Concept | Questions | Papers | Years |
|---|---|---|---|
| Mole Concept | 6 | 5 | 2026, 2017 |
| Stoichiometry | 5 | 5 | 2026, 2016 |
| Environmental Chemistry | 2 | 2 | 2017, 2016 |
| Empirical Formula | 1 | 1 | 2026 |
| Gas Laws | 1 | 1 | 2016 |
How to practise Some Basic Concepts in Chemistry PYQs
- Start with the concepts at the top of the table. They have come back the most.
- Solve one year’s Some Basic Concepts in Chemistry questions from the official PDF against the clock, then check the answer listed below.
- Log every miss as a concept gap, a calculation slip or a misread. Each needs a different fix.
- Once a concept is clean in two papers, move to the next. Then sit a full paper from the year pages.
Questions by year
Each line gives the question number and paper, type, concept, our one-line summary and the official answer, with a link to the official PDF.
JEE Main2026
- Q.51 (2 April, shift 1) · MCQ · Stoichiometry: Mass of iron converted to Fe3O4 by 18 g of steam (official answer: option 4) PDF
- Q.51 (2 April, shift 2) · MCQ · Stoichiometry: Mass of CO2 from burning a two-carbon hydrocarbon with C:H mass ratio 12:1 (official answer: option 2) PDF
- Q.51 (4 April, shift 1) · MCQ · Mole Concept: Moles and molecules in 1.4187 L of SO2 at STP (official answer: option 2) PDF
- Q.51 (4 April, shift 2) · MCQ · Mole Concept: Order of total number of atoms in cyclohexane, sucrose and H₂ samples (official answer: option 4) PDF
- Q.51 (5 April, shift 1) · MCQ · Stoichiometry: Mass of residue on heating silver carbonate (official answer: option 2) PDF
- Q.51 (5 April, shift 2) · MCQ · Stoichiometry: Volume of H₂ at STP from H₂SO₄ solution and zinc (official answer: option 3) PDF
- Q.51 (6 April, shift 1) · MCQ · Empirical Formula: Empirical formula of iron oxide with 69.9% iron (official answer: option 2) PDF
- Q.51 (6 April, shift 2) · MCQ · Mole Concept: Identify samples containing the same number of atoms (official answer: option 4) PDF
- Q.51 (8 April, shift 2) · MCQ · Mole Concept: Match given masses of substances with number of atoms (official answer: option 3) PDF
JEE Main2017
JEE Main2016
Some Basic Concepts in Chemistry in other exams
The same chapter in other official papers we tagged: JEE Advanced (14 questions), NEET (2 questions).
Other Chemistry chapters
- Atomic Structure PYQs
- Chemical Bonding and Molecular Structure PYQs
- Chemical Thermodynamics PYQs
- Solutions PYQs
- Equilibrium PYQs
- Redox Reactions and Electrochemistry PYQs
- Chemical Kinetics PYQs
- Classification of Elements and Periodicity PYQs
- p-Block Elements PYQs
- d- and f-Block Elements PYQs
- Coordination Compounds PYQs
- Purification and Characterisation of Organic Compounds PYQs
- Some Basic Principles of Organic Chemistry PYQs
- Hydrocarbons PYQs
- Organic Compounds Containing Halogens PYQs
- Organic Compounds Containing Oxygen PYQs
- Organic Compounds Containing Nitrogen PYQs
- Biomolecules PYQs
- Principles Related to Practical Chemistry PYQs
FAQ
How many Some Basic Concepts in Chemistry questions come in JEE Main?
In the official papers we tagged: 9 in 2026 (9 papers), 3 in 2017 (1 paper) and 3 in 2016 (1 paper). That is 15 questions in all, about 5% of Chemistry.
Which Some Basic Concepts in Chemistry topics repeat in JEE Main?
Asked in the most papers: Mole Concept, Stoichiometry, Environmental Chemistry. The concept table lists every one with its count.
Are these official JEE Main questions?
Yes. Every question is from an official JEE Main paper hosted on our year pages. The one-line summaries are ours; open the PDF linked beside each question for the full text.