NEET UG · Chemistry · Classification of Elements and Periodicity in Properties

Periodic Properties: NEET previous year questions

13 questions in ten years of NEET, in 9 of 10 papers. Pattern: Every year. Here is how it is asked and which ideas come back.

Asked in 10 years: 13; about 1.3 per paper
Years asked: 9/10; last asked 2026
Chance of a question next paper: 84%; historical rate, how we compute it
Weighted estimate: 1.5; model; history: 1.3 a paper on average, typically 1–2

Key findings

01
Asked in 9 of 10 papers, 13 questions in all: #45 of 204 topics by ten-year total. It comes back every 1.1 years on average.
02
83% of its questions since 2018 tested an idea never asked before; 1 repeated an idea from the year before.
03
The most repeated idea is Ionization Enthalpy Trends, asked 3 times (2019, 2024, 2025), usually as “order/ranking of property”.
04
NEET has asked 10 of the 88 ideas in this topic; 61 have never been asked, directly or indirectly.
05
Mostly asked as one-line MCQ (62%); 62% easy, 0% hard, and up from 1.0 to 1.9 questions a paper since 2024.

Questions per year

Up to 2023: 1.0; per paper
Since 2024: 1.9; +1.0
Usual gap: 1.1 yrs; between papers asking it
Swing: ±0.6; questions, year to year

Recent framings

order/ranking of property
assertion-reason on periodic trend
count correct statements on periodic trends

Revise first

Ionization Enthalpy Trends (2019 2024 2025); Fluorine vs Chlorine Electron Gain Enthalpy (2026); Ionization Enthalpy Anomaly: Nitrogen vs Oxygen (2026)

How it is asked

Difficulty, format and skill

Across all 13 questions on Periodic Properties since 2017.

Difficulty

QUESTIONS

Easy8 · 62%
Medium5 · 38%
Hard0 · 0%

Format

One-line MCQ · 8 Q62%
Other · 2 Q15%
Match the lists · 2 Q15%
Assertion–reason · 1 Q8%

Skill tested

Application · 6 Q46%
Recall · 4 Q31%
Concept · 3 Q23%

Repeats

New idea, or one asked before?

Each column is a paper. Blue questions tested an idea NEET had not asked before; navy ones went back to an idea from an earlier paper. 2017 is the first paper, so everything in it counts as new.

’17’18’19’20’21’22’23’24’25’26

Idea asked for the first time
Idea asked in an earlier paper

Coverage of the topic

NEET has asked 10 of the 88 ideas in this topic. 61 have never been asked yet.

101761

Asked directly10 · 11%
Touched inside another question17 · 19%
Never asked61 · 69%

Ideas come from Lumi’s syllabus map of NCERT. A never-asked idea is not a safe skip: most new questions come from exactly these.

Drill down

Idea, year, question

Every idea NEET tested in this topic, with its ten papers. Open one to read the questions.

ideaAskedShareYears’17’18’19’20’21’22’23’24’25’26

Repeated3 · 23%23%3/10
- 2025 · Q47
  Which of the following statements are true? A. Unlike Ga that has a very high melting point, Cs has a very low melting point. B. On…
  mediumOtherAsked the year before
- 2024 · Q71
  Arrange the following elements in increasing order of first ionization enthalpy: Li, Be, B, C, N Choose the correct answer from the…
  mediumOne-line MCQ
- 2019 · Q60
  For the second period elements the correct increasing order of first ionisation enthalpy is :
  mediumOne-line MCQNew idea
1 · 8%8%1/10
1 · 8%8%1/10
1 · 8%8%1/10
1 · 8%8%1/10
1 · 8%8%1/10
1 · 8%8%1/10
1 · 8%8%1/10
1 · 8%8%1/10
1 · 8%8%1/10
1 · 8%8%1/10

Squares are the ten papers, 2017 to 2026; darker means more questions. Share is of the level above.

Ideas

Every idea inside this topic

11 different ideas were tested; 1 came more than once. Ionization Enthalpy Trends is the foundation for 21 other ideas in the syllabus.

Ionization Enthalpy Trends3×
order/ranking of property
One-line MCQ · 11% next · foundation for 21
Fluorine vs Chlorine Electron Gain Enthalpy1×
order/ranking of property
One-line MCQ · 6% next
Ionization Enthalpy Anomaly: Nitrogen vs Oxygen1×
assertion-reason on periodic trend
Assertion–reason · 6% next
s, p, d, f Block Classification1×
identify elements by electronic configuration
Other · 6% next · foundation for 1
Electronegativity Trends1×
order/ranking of property
One-line MCQ · 6% next · foundation for 14
Radii of Isoelectronic Species1×
order/ranking of ionic size
One-line MCQ · 4% next
IUPAC Nomenclature for Z > 1001×
iupac name of element by atomic number
One-line MCQ · 4% next
Acidic, Basic, and Amphoteric Nature of Oxides1×
match list on oxide nature
Match the lists · 4% next · foundation for 3
IUPAC Nomenclature for Elements Z > 1001×
match list on element names
Match the lists · 4% next
Ionic Formulae from Configurations1×
predict formula of ionic compound
One-line MCQ · 4% next
Deducing Group, Period, and Block from Atomic Number1×
identify group and configuration from atomic number
One-line MCQ · 4% next

Idea	Times	Format	Chance next	Foundation for
Ionization Enthalpy Trendsorder/ranking of property	3	One-line MCQApplication	11%	21 ideas
Fluorine vs Chlorine Electron Gain Enthalpyorder/ranking of property	1	One-line MCQRecall	6%	–
Ionization Enthalpy Anomaly: Nitrogen vs Oxygenassertion-reason on periodic trend	1	Assertion–reasonConcept	6%	–
s, p, d, f Block Classificationidentify elements by electronic configuration	1	OtherApplication	6%	1 ideas
Electronegativity Trendsorder/ranking of property	1	One-line MCQApplication	6%	14 ideas
Radii of Isoelectronic Speciesorder/ranking of ionic size	1	One-line MCQConcept	4%	–
IUPAC Nomenclature for Z > 100iupac name of element by atomic number	1	One-line MCQRecall	4%	–
Acidic, Basic, and Amphoteric Nature of Oxidesmatch list on oxide nature	1	Match the listsRecall	4%	3 ideas
IUPAC Nomenclature for Elements Z > 100match list on element names	1	Match the listsRecall	4%	–
Ionic Formulae from Configurationspredict formula of ionic compound	1	One-line MCQApplication	4%	–
Deducing Group, Period, and Block from Atomic Numberidentify group and configuration from atomic number	1	One-line MCQApplication	4%	–

Chance next is the historical rate at which an idea with this record came back in the following paper. It is low for every idea, which is why learning the topic beats memorising past questions. All repeated ideas

Every question

Periodic Properties questions, year by year

The opening words of each question as it appeared in the official paper, with the idea it tested.

NEET 20262 questions

Q53
Among the following options, the correct trend in the electron gain enthalpy is
Idea: Fluorine vs Chlorine Electron Gain Enthalpy
New ideaEasyOne-line MCQ
Q70
Given below are two statements : One is labelled as Assertion A and the other is labelled as Reason R. Assertion A : The first ionization…
Idea: Ionization Enthalpy Anomaly: Nitrogen vs Oxygen
New ideaMediumAssertion–reason

NEET 20252 questions

Q47
Which of the following statements are true? A. Unlike Ga that has a very high melting point, Cs has a very low melting point. B. On…
Idea: Ionization Enthalpy Trends
Asked last yearMediumOther
Q53
Which among the following electronic configurations belong to main group elements? A. [Ne] $3s^1$ B. [Ar] $3d^3 4s^2$ C. [Kr]…
Idea: s, p, d, f Block Classification
New ideaEasyOther

NEET 20242 questions

Q71
Arrange the following elements in increasing order of first ionization enthalpy: Li, Be, B, C, N Choose the correct answer from the…
Idea: Ionization Enthalpy Trends
MediumOne-line MCQ
Q79
Arrange the following elements in increasing order of electronegativity: N, O, F, C, Si Choose the correct answer from the options given…
Idea: Electronegativity Trends
New ideaEasyOne-line MCQ

NEET 20231 question

Q69
The element expected to form largest ion to achieve the nearest noble gas configuration is :
Idea: Radii of Isoelectronic Species
New ideaEasyOne-line MCQ

NEET 20221 question

Q51
The IUPAC name of an element with atomic number 119 is
Idea: IUPAC Nomenclature for Z > 100
New ideaEasyOne-line MCQ

NEET 20202 questions

Q96
Identify the incorrect match. Name | IUPAC Official Name (a) Unnilunium | (i) Mendelevium (b) Unniltrium | (ii) Lawrencium (c) Unnilhexium…
Idea: IUPAC Nomenclature for Elements Z > 100
New ideaMediumMatch the lists
Q131
Match the following : Oxide | Nature (a) CO | (i) Basic (b) BaO | (ii) Neutral (c) $\mathrm{Al_2O_3}$ | (iii) Acidic (d)…
Idea: Acidic, Basic, and Amphoteric Nature of Oxides
New ideaEasyMatch the lists

NEET 20191 question

Q60
For the second period elements the correct increasing order of first ionisation enthalpy is :
Idea: Ionization Enthalpy Trends
New ideaMediumOne-line MCQ

NEET 20181 question

Q88
Magnesium reacts with an element (X) to form an ionic compound. If the ground state electronic configuration of (X) is $1s^2 2s^2 2p^3$ ,…
Idea: Ionic Formulae from Configurations
New ideaEasyOne-line MCQ

NEET 20171 question

Q72
The element Z = 114 has been discovered recently. It will belong to which of the following family/group and electronic configuration ?
Idea: Deducing Group, Period, and Block from Atomic Number
EasyOne-line MCQ

Questions from the official NEET UG papers published by NTA (CBSE before 2019). Topic and idea tags, counts and notes are Lumi’s.