JEE Main · Chemistry · Classification of Elements and Periodicity in Properties
Periodic Trends: JEE Main previous year questions
99 questions in the 108 JEE Main shifts Lumi analysed, in 7 of 8 years. Pattern: Asked most years. 43 came in 2024–26. Here is how it is asked and which ideas come back.
- Questions
- 99
- in 78 of 108 shifts
- Years asked
- 7/8
- last asked 2026
- Weighted estimate
- 0.9
- model; history: 0.8 a shift on average, typically 0.6–1.2
Key findings
- 01
Asked in 7 of 8 years with analysed shifts and in 78 of 108 shifts: 99 questions, #7 of 196 topics.
- 02
32% of its questions since 2020 tested an idea no earlier year had asked; 42 repeated an idea from the year before.
- 03
The most repeated idea is Ionization Enthalpy Trends, asked 14 times in 14 shifts (2020, 2021, 2022, 2024, 2025, 2026), most often as “count correct statements on periodic trends”.
- 04
JEE Main has asked 25 of the 44 ideas in this topic; 11 have never been asked, directly or inside another question.
- 05
Mostly asked as single correct (55%); 5% need a numerical answer, 54% are easy and 0% hard. It went up from 0.6 to 1.1 questions a shift since 2024.
- 06
The skill tested most is conceptual (48%), then recall (32%).
Questions a shift, year by year
Out of the 25 Chemistry questions in a shift. Years differ in how many shifts Lumi analysed, so each year is scaled to one shift.
Raw count: 2017: 0 in 1 shift · 2020: 13 in 12 shifts · 2021: 16 in 24 shifts · 2022: 19 in 24 shifts · 2023: 8 in 12 shifts · 2024: 25 in 18 shifts · 2025: 7 in 8 shifts · 2026: 11 in 9 shifts.
- Up to 2023
- 0.6
- a shift, of 25
- Since 2024
- 1.1
- +0.5
- Usual gap
- 1.0 yrs
- between years asking it
- Shifts with it
- 78/108
- 72% of analysed shifts
Recent framings
- match list on ionization enthalpy values
- numerical: energy from successive ionization enthalpies
- periodic trend across a period
Revise first
- Ionization Enthalpy Trends · asked 2020, 2021, 2022, 2024, 2025, 2026
- Acidic and Basic Character of Oxides · asked 2020, 2022, 2024, 2026
- Electron Gain Enthalpy · asked 2021, 2022, 2023, 2024, 2025
How it is asked
Difficulty, format and skill
Across all 99 questions on Periodic Trends since 2017.
Difficulty
QUESTIONS- Easy53 · 54%
- Medium46 · 46%
- Hard0 · 0%
Format
SHARE- Single correct · 54 Q55%
- Two statements · 15 Q15%
- Other · 13 Q13%
- Assertion–reason · 8 Q8%
- Numerical value · 5 Q5%
- Match the list · 4 Q4%
Skill tested
SHARE- Conceptual · 48 Q48%
- Recall · 32 Q32%
- Application · 13 Q13%
- Data or graph · 3 Q3%
- Calculation · 2 Q2%
- Multi-step · 1 Q1%
Repeats
New idea, or one asked before?
Each column is a year. Blue questions tested an idea no earlier year had asked; navy ones went back to an idea from an earlier year. 2017 is the first year, so everything in it counts as new. Heights are question counts, and Lumi analysed 1 to 24 shifts a year, so compare the split inside a column rather than heights across years.
- Idea asked for the first time
- Idea asked in an earlier year
Coverage of the topic
JEE Main has asked 25 of the 44 ideas in this topic. 11 have never been asked yet.
- Asked directly25 · 57%
- Touched inside another question8 · 18%
- Never asked11 · 25%
Ideas come from Lumi’s JEE syllabus map. A never-asked idea is not a safe skip: across all of JEE Main, 22% of questions since 2024 tested an idea no earlier year had asked.
Drill down
Chapter, idea, question
Every idea JEE Main tested in this topic, with its eight years. Open one to read the questions.
17 ideas inside
Squares are the 8 years with analysed shifts, 2017 to 2026. A number is the questions that year when there is more than one; the shade is scaled to one shift, so a year with more analysed shifts (1 to 24 a year) does not look darker. Share is of the level above.
Ideas
Every idea inside this topic
25 different ideas were tested; 17 came more than once.
count correct statements on periodic trends
Single correct · 14 shifts · 1 numericalidentify set of oxides by nature
Single correct · 11 shifts · 1 numericalorder/ranking of electron gain enthalpy
Other · 10 shiftsorder/ranking of ionic radii
Single correct · 10 shifts · 1 numericalorder/ranking of ionization enthalpy
Single correct · 8 shiftsidentify incorrect trend in atomic radii
Single correct · 6 shiftsstatement i/ii on ionization enthalpy trends
Single correct · 5 shiftsstatement i/ii on electronegativity and oxidation state
Single correct · 4 shiftsiupac name of element from configuration
Numerical value · 4 shifts · 2 numericalclassify elements as metal or metalloid
Single correct · 4 shiftsstatement i/ii on group 16 oxygen
Other · 2 shiftsbond length from covalent radii
Single correct · 2 shiftsstatement i/ii on hydride acidity and bond enthalpy
Assertion–reason · 2 shiftsassertion-reason on boiling points of hydrides
Assertion–reason · 2 shiftsgroup 13 plus one state stability
Two statements · 2 shiftsorder/ranking of electron gain enthalpy
Single correct · 2 shiftsorder of first ionization energies
Single correct · 2 shiftsstatement i/ii on atomic and ionic radii
Two statements · 1 shiftcount correct statements on group 15 hydrides
Other · 1 shiftassertion-reason on oxygen and sulphur allotropes
Assertion–reason · 1 shiftcount elements unable to show group valency
Single correct · 1 shiftdensity order of alkali metals
Single correct · 1 shiftodd-one-out among element pairs
Single correct · 1 shiftorder/ranking of ionic conductivity in water
Single correct · 1 shiftidentify element with positive electron gain enthalpy
Single correct · 1 shift
| Idea | Years asked | Times | Shifts | Format | Numerical |
|---|---|---|---|---|---|
| Ionization Enthalpy Trendscount correct statements on periodic trends | 14 | 14 | Single correctConceptual | 1 | |
| Acidic and Basic Character of Oxidesidentify set of oxides by nature | 12 | 11 | Single correctRecall | 1 | |
| Electron Gain Enthalpyorder/ranking of electron gain enthalpy | 10 | 10 | OtherConceptual | – | |
| Isoelectronic Species Radii Comparisonorder/ranking of ionic radii | 10 | 10 | Single correctConceptual | 1 | |
| p-Block Ionization Enthalpy Inversionsorder/ranking of ionization enthalpy | 8 | 8 | Single correctConceptual | – | |
| Atomic and Ionic Radii Trendsidentify incorrect trend in atomic radii | 6 | 6 | Single correctConceptual | – | |
| Successive Ionization Enthalpy Jumpsstatement i/ii on ionization enthalpy trends | 5 | 5 | Single correctData or graph | – | |
| Electronegativity Scalesstatement i/ii on electronegativity and oxidation state | 4 | 4 | Single correctRecall | – | |
| IUPAC Nomenclature for Z > 100iupac name of element from configuration | 4 | 4 | Numerical valueApplication | 2 | |
| Metallic and Non-Metallic Character Trendsclassify elements as metal or metalloid | 4 | 4 | Single correctRecall | – | |
| Anomalous Behavior of Second Period Elementsstatement i/ii on group 16 oxygen | 2 | 2 | OtherRecall | – | |
| Van der Waals vs Covalent vs Metallic Radiibond length from covalent radii | 2 | 2 | Single correctConceptual | – | |
| Acidic Strength Trends of p-Block Hydridesstatement i/ii on hydride acidity and bond enthalpy | 2 | 2 | Assertion–reasonConceptual | – | |
| Boiling Point Anomalies of p-Block Hydridesassertion-reason on boiling points of hydrides | 2 | 2 | Assertion–reasonConceptual | – | |
| Inert Pair Effect and Oxidation State Stabilitygroup 13 plus one state stability | 2 | 2 | Two statementsConceptual | – | |
| Positive Electron Gain Enthalpyorder/ranking of electron gain enthalpy | 2 | 2 | Single correctConceptual | – | |
| Penetration Effect on Ionization Enthalpyorder of first ionization energies | 2 | 2 | Single correctConceptual | – | |
| Aluminum vs Gallium Radius Anomalystatement i/ii on atomic and ionic radii | 1 | 1 | Two statementsConceptual | – | |
| Acidic and Reducing Nature of Hydridescount correct statements on group 15 hydrides | 1 | 1 | OtherConceptual | – | |
| pπ-pπ Multiple Bonding in Second Periodassertion-reason on oxygen and sulphur allotropes | 1 | 1 | Assertion–reasonConceptual | – | |
| Valency and Oxidation Statescount elements unable to show group valency | 1 | 1 | Single correctConceptual | – | |
| Density Anomaly in Alkali Metals (K vs Na)density order of alkali metals | 1 | 1 | Single correctRecall | – | |
| Diagonal Relationshipodd-one-out among element pairs | 1 | 1 | Single correctConceptual | – | |
| Hydration Enthalpy and Ionic Mobilityorder/ranking of ionic conductivity in water | 1 | 1 | Single correctConceptual | – | |
| Positive Electron Gain Enthalpy of Noble Gasesidentify element with positive electron gain enthalpy | 1 | 1 | Single correctRecall | – |
Times and shifts count every analysed shift. Across JEE Main, 78% of questions since 2024 went back to an idea an earlier year had asked; the rest were new. All repeated ideas
Every question
Periodic Trends questions, year by year
The newest 40 show their opening words as they appeared in the official paper; older ones name the idea they tested. Open one for its options and the official answer.
JEE Main 202611 questions in 9 shifts
- 2 Apr, Shift 1Q59Given below are two statements : Statement (I) : The first ionisation enthalpy of the elements Na, Mg, Cl and Ar follows the order Na > Mg…
Idea: Successive Ionization Enthalpy Jumps
MediumTwo statements - 2 Apr, Shift 2Q58The correct set that contains all kinds (basic, acidic, amphoteric and neutral) of oxides is:
Idea: Acidic and Basic Character of Oxides
MediumSingle correct - 2 Apr, Shift 2Q59Given below are two statements: Statement I: The second ionization enthalpy of B, Al and Ga is in the order of B > Al > Ga. Statement II:…
Idea: Ionization Enthalpy Trends
Asked the year beforeMediumSingle correct - 4 Apr, Shift 1Q59Given below are two statements: Statement I: The covalency of oxygen is generally two but it can exceed upto four. The oxidation state of…
Idea: Anomalous Behavior of Second Period Elements
MediumTwo statements - 4 Apr, Shift 2Q57The ionization enthalpy for Mg is +737 kJ/mol. The most probable estimated value of the ionization…
Idea: Successive Ionization Enthalpy Jumps
EasySingle correct - 5 Apr, Shift 1Q58Given below are two statements: Statement I: The correct order of electronegativity of fluorine, oxygen and nitrogen is F > O > N.…
Idea: Electronegativity Scales
Asked the year beforeEasyTwo statements - 5 Apr, Shift 2Q53The covalent radii of atoms A and B are and , respectively. The covalent bond length and total length of AB molecule are…
Idea: Van der Waals vs Covalent vs Metallic Radii
MediumSingle correct - 5 Apr, Shift 2Q58Given below are two statements : Statement I : The number of pairs among , ,…
Idea: Acidic and Basic Character of Oxides
MediumTwo statements - 6 Apr, Shift 1Q71First and second ionization enthalpies of lithium are 520 kJ mol and 7297 kJ mol respectively. Energy required to convert…
Idea: Ionization Enthalpy Trends
Asked the year beforeEasyNumerical value - 6 Apr, Shift 2Q58In a period, the first ionisation enthalpy of the element at extreme left and the negative electron gain enthalpy of the extreme right…
Idea: Ionization Enthalpy Trends
Asked the year beforeEasySingle correct - 8 Apr, Shift 2Q58Match List - I with List - II. List - I (Electronic configuration of neutral atom (where n = 2)) | List - II (1 Ionization Energy…
Idea: Ionization Enthalpy Trends
Asked the year beforeMediumMatch the list
JEE Main 20257 questions in 5 shifts
- 2 Apr, Shift 1Q58The property/properties that show irregularity in first four elements of group-17 is/are : (A) Covalent radius (B) Electron affinity (C)…
Idea: Electron Gain Enthalpy
Asked the year beforeMediumOther - 2 Apr, Shift 1Q59Given below are two statements : Statement (I) : The metallic radius of Al is less than that of Ga. Statement (II) : The ionic radius of…
Idea: Aluminum vs Gallium Radius Anomaly
New ideaMediumTwo statements - 2 Apr, Shift 2Q58Electronic configuration of four elements A, B, C and D are given below : (A) (B) (C) (D)…
Idea: Electronegativity Scales
Asked the year beforeEasySingle correct - 3 Apr, Shift 1Q60Which of the following statements are correct ? A. The process of adding an electron to a neutral gaseous atom is always exothermic. B.…
Idea: Ionization Enthalpy Trends
Asked the year beforeMediumOther - 7 Apr, Shift 2Q59Choose the incorrect trend in the atomic radii (r) of the elements.
Idea: Atomic and Ionic Radii Trends
Asked the year beforeEasySingle correct - 8 Apr, Shift 2Q56The atomic number of the element from the following with lowest 1 ionisation enthalpy is :
Idea: Ionization Enthalpy Trends
Asked the year beforeEasySingle correct - 8 Apr, Shift 2Q57Given below are two statements: Statement I : is more acidic than Statement II : has…
Idea: Acidic Strength Trends of p-Block Hydrides
Asked the year beforeEasyTwo statements
JEE Main 202425 questions in 15 shifts
- 4 Apr, Shift 1Q66The correct order of first ionization enthalpy values of the following elements is : (A) O (B) N (C) Be (D) F (E) B Choose the correct…
Idea: Ionization Enthalpy Trends
MediumOther - 4 Apr, Shift 1Q67Number of elements from the following that CANNOT form compounds with valencies which match with their respective group valencies is…
Idea: Valency and Oxidation States
New ideaMediumSingle correct - 4 Apr, Shift 2Q66Given below are two statements : Statement I : The correct order of first ionization enthalpy values of Li, Na, F and Cl is Na < Li < Cl <…
Idea: Ionization Enthalpy Trends
MediumTwo statements - 4 Apr, Shift 2Q67The correct order of the first ionization enthalpy is
Idea: p-Block Ionization Enthalpy Inversions
Asked the year beforeMediumSingle correct - 5 Apr, Shift 1Q66The statement(s) that are correct about the species , , and . (A) All are…
Idea: Isoelectronic Species Radii Comparison
Asked the year beforeEasyOther - 5 Apr, Shift 1Q67Given below are two statements : Statement I : In group 13, the stability of oxidation state increases down the group. Statement II :…
Idea: Inert Pair Effect and Oxidation State Stability
Asked the year beforeEasyTwo statements - 5 Apr, Shift 2Q66Given below are two statements : Statement I : The metallic radius of Na is and the ionic radius of…
Idea: Atomic and Ionic Radii Trends
EasyTwo statements - 6 Apr, Shift 1Q66The electron affinity value are negative for A. B. C.…
Idea: Electron Gain Enthalpy
Asked the year beforeMediumOther - 6 Apr, Shift 2Q68Evaluate the following statements related to group 14 elements for their correctness. (A) Covalent radius decreases down the group from C…
Idea: Anomalous Behavior of Second Period Elements
New ideaMediumOther - 8 Apr, Shift 1Q68Match List I with List II LIST I (Elements): A. Cl, S; B. Ge, As; C. Fr, Ra; D. F, O LIST II (Properties in their respective groups): I.…
Idea: Electron Gain Enthalpy
Asked the year beforeMediumMatch the list - 9 Apr, Shift 1Q66Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A) : Both rhombic…
Idea: pπ-pπ Multiple Bonding in Second Period
New ideaMediumAssertion–reason - 1 Feb, Shift 1Q65In case of isoelectronic species the size of , Ne and is affected by :
Idea: Isoelectronic Species Radii Comparison
Asked the year beforeEasySingle correct - 1 Feb, Shift 1Q66Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A) : …
Idea: Boiling Point Anomalies of p-Block Hydrides
EasyAssertion–reason - 1 Feb, Shift 1Q87Among the following oxides of p-block elements, number of oxides having amphoteric nature is ________. , CO,…
Idea: Acidic and Basic Character of Oxides
MediumNumerical value - 1 Feb, Shift 2Q65Given below are two statements : Statement (I) : Both metals and non-metals exist in p and d-block elements. Statement (II) : Non-metals…
Idea: Ionization Enthalpy Trends
EasyTwo statements - 29 Jan, Shift 1Q64Given below are two statements : one is labelled as Assertion A and the other is labelled as Reason R : Assertion A : The first ionisation…
Idea: Ionization Enthalpy Trends
EasyAssertion–reason - 29 Jan, Shift 1Q66Given below are two statements : Statement I : The electronegativity of group 14 elements from Si to Pb, gradually decreases. Statement II…
Idea: Electronegativity Scales
Asked the year beforeMediumTwo statements - 30 Jan, Shift 1Q65Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A) : There is a…
Idea: Atomic and Ionic Radii Trends
MediumAssertion–reason - 30 Jan, Shift 1Q88If IUPAC name of an element is "Unununnium" then the element belongs to n group of Periodic table. The value of n is ________.
Idea: IUPAC Nomenclature for Z > 100
EasyNumerical value - 30 Jan, Shift 2Q66Given below are two statements: Statement - I: Along the period, the chemical reactivity of the elements gradually increases from group 1…
Idea: Acidic and Basic Character of Oxides
EasyTwo statements - 30 Jan, Shift 2Q67Choose the correct statements about the hydrides of group 15 elements. A. The stability of the hydrides decreases in the order…
Idea: Acidic and Reducing Nature of Hydrides
New ideaMediumOther - 30 Jan, Shift 2Q68Given below are two statements: One is labelled as Assertion A and the other is labelled as Reason R: Assertion A: is…
Idea: Acidic Strength Trends of p-Block Hydrides
New ideaMediumAssertion–reason - 31 Jan, Shift 1 · Q66Electron Gain EnthalpyAsked the year beforeMedium
- 31 Jan, Shift 1 · Q67Acidic and Basic Character of OxidesMedium
- 31 Jan, Shift 2 · Q66Atomic and Ionic Radii TrendsMedium
JEE Main 20238 questions in 7 shifts
- 6 Apr, Shift 1 · Q64Positive Electron Gain EnthalpyMedium
- 8 Apr, Shift 1 · Q64Electronegativity ScalesNew ideaMedium
- 10 Apr, Shift 2 · Q64Metallic and Non-Metallic Character TrendsAsked the year beforeEasy
- 11 Apr, Shift 1 · Q64p-Block Ionization Enthalpy InversionsAsked the year beforeEasy
- 12 Apr, Shift 1 · Q65Density Anomaly in Alkali Metals (K vs Na)New ideaEasy
- 12 Apr, Shift 1 · Q70Inert Pair Effect and Oxidation State StabilityNew ideaMedium
- 13 Apr, Shift 1 · Q64Electron Gain EnthalpyAsked the year beforeMedium
- 15 Apr, Shift 1 · Q87Isoelectronic Species Radii ComparisonAsked the year beforeEasy
JEE Main 202219 questions in 17 shifts
- 25 Jul, Shift 1 · Q66IUPAC Nomenclature for Z > 100Medium
- 25 Jul, Shift 2 · Q66p-Block Ionization Enthalpy InversionsAsked the year beforeEasy
- 25 Jul, Shift 2 · Q70Acidic and Basic Character of OxidesMedium
- 26 Jul, Shift 1 · Q63Van der Waals vs Covalent vs Metallic RadiiNew ideaMedium
- 27 Jul, Shift 1 · Q66Ionization Enthalpy TrendsAsked the year beforeMedium
- 27 Jul, Shift 2 · Q66p-Block Ionization Enthalpy InversionsAsked the year beforeMedium
- 28 Jul, Shift 1 · Q65Electron Gain EnthalpyAsked the year beforeMedium
- 28 Jul, Shift 2 · Q32Metallic and Non-Metallic Character TrendsAsked the year beforeEasy
- 29 Jul, Shift 1 · Q64p-Block Ionization Enthalpy InversionsAsked the year beforeMedium
- 30 Jul, Shift 2 · Q35Ionization Enthalpy TrendsAsked the year beforeEasy
- 24 Jun, Shift 1 · Q66Acidic and Basic Character of OxidesMedium
- 25 Jun, Shift 2 · Q66Electron Gain EnthalpyAsked the year beforeMedium
- 27 Jun, Shift 1 · Q65Isoelectronic Species Radii ComparisonAsked the year beforeEasy
- 27 Jun, Shift 2 · Q65Isoelectronic Species Radii ComparisonAsked the year beforeEasy
- 28 Jun, Shift 1 · Q67Acidic and Basic Character of OxidesMedium
- 28 Jun, Shift 2 · Q66Acidic and Basic Character of OxidesEasy
- 28 Jun, Shift 2 · Q69Acidic and Basic Character of OxidesEasy
- 29 Jun, Shift 2 · Q66p-Block Ionization Enthalpy InversionsAsked the year beforeEasy
- 30 Jun, Shift 1 · Q66Electron Gain EnthalpyAsked the year beforeEasy
JEE Main 202116 questions in 14 shifts
- 4 Aug, Shift 1 · Q35p-Block Ionization Enthalpy InversionsNew ideaEasy
- 4 Aug, Shift 2 · Q32Positive Electron Gain Enthalpy of Noble GasesNew ideaEasy
- 27 Aug, Shift 2 · Q32Isoelectronic Species Radii ComparisonAsked the year beforeEasy
- 31 Aug, Shift 1 · Q35Metallic and Non-Metallic Character TrendsNew ideaEasy
- 24 Feb, Shift 1 · Q33Penetration Effect on Ionization EnthalpyAsked the year beforeMedium
- 26 Feb, Shift 1 · Q33p-Block Ionization Enthalpy InversionsNew ideaMedium
- 26 Feb, Shift 2 · Q33Electron Gain EnthalpyNew ideaMedium
- 25 Jul, Shift 1 · Q33Isoelectronic Species Radii ComparisonAsked the year beforeEasy
- 25 Jul, Shift 2 · Q34Isoelectronic Species Radii ComparisonAsked the year beforeEasy
- 16 Mar, Shift 2 · Q33Metallic and Non-Metallic Character TrendsNew ideaMedium
- 16 Mar, Shift 2 · Q36Successive Ionization Enthalpy JumpsAsked the year beforeEasy
- 17 Mar, Shift 1 · Q33Electron Gain EnthalpyNew ideaEasy
- 17 Mar, Shift 1 · Q36Hydration Enthalpy and Ionic MobilityNew ideaMedium
- 17 Mar, Shift 2 · Q34Diagonal RelationshipNew ideaEasy
- 18 Mar, Shift 1 · Q34Isoelectronic Species Radii ComparisonAsked the year beforeEasy
- 18 Mar, Shift 2 · Q34Ionization Enthalpy TrendsAsked the year beforeEasy
JEE Main 202013 questions in 11 shifts
- 8 Jan, Shift 1 · Q32Penetration Effect on Ionization EnthalpyNew ideaEasy
- 8 Jan, Shift 2 · Q32Atomic and Ionic Radii TrendsNew ideaEasy
- 9 Jan, Shift 1 · Q32Ionization Enthalpy TrendsNew ideaMedium
- 9 Jan, Shift 1 · Q34Acidic and Basic Character of OxidesNew ideaEasy
- 9 Jan, Shift 2 · Q32Successive Ionization Enthalpy JumpsNew ideaEasy
- 2 Sep, Shift 1 · Q32Atomic and Ionic Radii TrendsNew ideaEasy
- 2 Sep, Shift 2 · Q32Acidic and Basic Character of OxidesNew ideaEasy
- 3 Sep, Shift 1 · Q32IUPAC Nomenclature for Z > 100New ideaEasy
- 3 Sep, Shift 1 · Q33Boiling Point Anomalies of p-Block HydridesNew ideaEasy
- 3 Sep, Shift 2 · Q32Successive Ionization Enthalpy JumpsNew ideaEasy
- 4 Sep, Shift 1 · Q32Isoelectronic Species Radii ComparisonNew ideaEasy
- 4 Sep, Shift 2 · Q32Positive Electron Gain EnthalpyNew ideaEasy
- 6 Sep, Shift 2 · Q46IUPAC Nomenclature for Z > 100New ideaEasy
Questions from the official JEE Main Paper 1 shifts published by NTA (CBSE for 2017). Questions NTA dropped are left out. Topic and idea tags, counts and notes are Lumi’s.
More topics in Classification of Elements and Periodicity in Properties
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