Questions
17
across 8 papers
Share of subject
4.3%
of 398 Chemistry Qs
Weightage rank
#10
of 31 chapters
Difficulty
4 easy · 7 medium · 6 hard
Some Basic Concepts of Chemistry contributed 17 of the 398 NEET Chemistry questions between 2020 and 2026 (Re-NEET 2026 included). That is 4.3% of the subject and makes it the #10 chapter out of 31 by weightage — roughly 2.1 questions per paper, peaking at 3 in NEET 2023.
Of the 17 questions tagged for difficulty, 24% were easy, 41% medium and 35% hard — a chapter that tends to bring the tougher questions.
It has been asked more often lately: 2.3 questions per paper across NEET 2025, NEET 2026 and Re-NEET 2026, against 1.3 in 2020–2022.
The single most-tested topic is Stoichiometry and Stoichiometric Calculations (Limiting Reagent) — 5 questions across 4 papers.
11 topics tagged under Some Basic Concepts of Chemistry. Numbers show how many questions each topic had in each paper; E / M / H are the easy, medium and hard counts.
| Topic | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 | 2026 | Re | Total | E | M | H |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Stoichiometry and Stoichiometric Calculations (Limiting Reagent) | – | – | 1 | 2 | – | – | 1 | 1 | 5 | 1 | 2 | 2 |
| Empirical and Molecular formula | – | 1 | – | – | 1 | – | – | – | 2 | – | 2 | – |
| Mole Concept and Molar Masses (Mole Concept) | – | – | – | – | – | 1 | 1 | – | 2 | – | 1 | 1 |
| Atoms and Molecules | 1 | – | – | – | – | – | – | – | 1 | – | – | 1 |
| Concentration Terms & Application (Molality (m)) | – | – | 1 | – | – | – | – | – | 1 | 1 | – | – |
| Dalton's Atomic Theory | – | – | – | – | – | 1 | – | – | 1 | 1 | – | – |
| Formula Mass | – | – | – | – | – | – | – | 1 | 1 | 1 | – | – |
| Miscellaneous (Other Gas Equations) | – | – | – | 1 | – | – | – | – | 1 | – | – | 1 |
| Mole | – | – | – | – | 1 | – | – | – | 1 | – | 1 | – |
| Titration (Simple Titration) | – | – | – | – | 1 | – | – | – | 1 | – | – | 1 |
| Uncertainty in Measurement (Significant Figures) r– | – | – | – | – | – | – | – | 1 | 1 | – | 1 | – |
In the NEET papers from 2020 to 2026 (including Re-NEET 2026), 17 Chemistry questions came from Some Basic Concepts of Chemistry — 4.3% of the subject, or about 2.1 per paper.
By past weightage it ranks #10 of 31 Chemistry chapters, so it is an above-average-weightage Chemistry chapter, with 17 questions over 2020–2026.
The most-tested topics are Stoichiometry and Stoichiometric Calculations (Limiting Reagent) (5), Empirical and Molecular formula (2) and Mole Concept and Molar Masses (Mole Concept) (2). The topic table above lists every topic with its count in each paper.
Of the 17 difficulty-tagged questions, 24% were easy, 41% medium and 35% hard.
Stoichiometry and Stoichiometric Calculations (Limiting Reagent), Mole Concept and Molar Masses (Mole Concept), Formula Mass and Uncertainty in Measurement (Significant Figures) r– were asked in the 2026 papers.
Edurack has chapter-wise NEET previous-year questions for Some Basic Concepts of Chemistry. Use the practice button on this page to open the set, attempt questions and check your answers.
Counts come from Edurack's tagged set of NEET papers 2020–2026 (including Re-NEET 2026), mapped to NCERT chapters and topics. Use them as a trend guide — past frequency doesn't guarantee what a future paper will ask.