NEET UG · Chemistry · Hydrogen

Hydrogen and Water: NEET previous year questions

This topic’s chapter, Hydrogen, is not in the NEET UG 2026 syllabus. It had 6 questions from 2017 to 2023; they are kept here for reference.

Asked in 10 years: 6; about 0.6 per paper
Years asked: 6/10; last asked 2023
Syllabus: Dropped; not in NEET UG 2026
Last asked: 2023; 3 papers ago

Key findings

01
Asked in 6 of 10 papers, 6 questions in all: #137 of 204 topics by ten-year total. Last asked in 2023.
02
83% of its questions since 2018 tested an idea never asked before; none repeated an idea from the year before.
03
The most repeated idea is Classification of Hydrides, asked 2 times (2018, 2022), usually as “order/ranking of ionic character”.
04
NEET has asked 0 of the 5 ideas in this topic; 0 have never been asked, directly or indirectly.
05
Mostly asked as one-line MCQ (50%); 33% easy, 0% hard, and down from 0.8 to 0.0 questions a paper since 2024.

Questions per year

Up to 2023: 0.8; per paper
Since 2024: 0.0; -0.8
Usual gap: 1.0 yrs; between papers asking it
Swing: ±0.5; questions, year to year

How it is asked

Difficulty, format and skill

Across all 6 questions on Hydrogen and Water since 2017.

Difficulty

QUESTIONS

Easy2 · 33%
Medium4 · 67%
Hard0 · 0%

Format

One-line MCQ · 3 Q50%
Match the lists · 2 Q33%
Other · 1 Q17%

Skill tested

Recall · 5 Q83%
Concept · 1 Q17%

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 0 of the 5 ideas in this topic. 0 have never been asked yet.

Asked directly0 · 0%
Touched inside another question5 · 100%
Never asked0 · 0%

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

Repeated2 · 33%33%2/10
- 2022 · Q66
  Match List - I with List - II. List - I (Hydrides) | List - II (Nature) (a) $\mathrm{MgH_2}$ | (i) Electron precise (b) $\mathrm{GeH_4}$ |…
  mediumMatch the lists
- 2018 · Q80
  Among $\mathrm{CaH_2}$ , $\mathrm{BeH_2}$ , $\mathrm{BaH_2}$ , the order of ionic character is
  mediumOne-line MCQNew idea
1 · 17%17%1/10
1 · 17%17%1/10
1 · 17%17%1/10
1 · 17%17%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

5 different ideas were tested; 1 came more than once.

Classification of Hydrides2×
order/ranking of ionic character
Match the lists · 4% next
Properties and Uses of Hydrogen and Heavy Water1×
count incorrect statements on hydrogen
Other · 4% next
Isotopes of Hydrogen1×
identify particle emitted by isotope
One-line MCQ · 4% next
Preparation of Dihydrogen1×
match list on assorted hydrogen chemistry
Match the lists · 4% next
Hardness of Water1×
definition recall
One-line MCQ · 4% next

Idea	Times	Format	Chance next	Foundation for
Classification of Hydridesorder/ranking of ionic character	2	Match the listsConcept	4%	–
Properties and Uses of Hydrogen and Heavy Watercount incorrect statements on hydrogen	1	OtherRecall	4%	–
Isotopes of Hydrogenidentify particle emitted by isotope	1	One-line MCQRecall	4%	–
Preparation of Dihydrogenmatch list on assorted hydrogen chemistry	1	Match the listsRecall	4%	–
Hardness of Waterdefinition recall	1	One-line MCQRecall	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

Hydrogen and Water questions, year by year

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

NEET 20231 question

Q64
Which of the following statements are NOT correct? A. Hydrogen is used to reduce heavy metal oxides to metals. B. Heavy water is used to…
Idea: Properties and Uses of Hydrogen and Heavy Water
New ideaMediumOther

NEET 20221 question

Q66
Match List - I with List - II. List - I (Hydrides) | List - II (Nature) (a) $\mathrm{MgH_2}$ | (i) Electron precise (b) $\mathrm{GeH_4}$ |…
Idea: Classification of Hydrides
MediumMatch the lists

NEET 20211 question

Q72
Tritium, a radioactive isotope of hydrogen, emits which of the following particles ?
Idea: Isotopes of Hydrogen
New ideaEasyOne-line MCQ

NEET 20201 question

Q130
Match the following and identify the correct option. (a) $\mathrm{CO(g) + H_2(g)}$ | (i) $\mathrm{Mg(HCO_3)_2 + Ca(HCO_3)_2}$ (b)…
Idea: Preparation of Dihydrogen
New ideaMediumMatch the lists

NEET 20191 question

Q88
The method used to remove temporary hardness of water is :
Idea: Hardness of Water
New ideaEasyOne-line MCQ

NEET 20181 question

Q80
Among $\mathrm{CaH_2}$ , $\mathrm{BeH_2}$ , $\mathrm{BaH_2}$ , the order of ionic character is
Idea: Classification of Hydrides
New ideaMediumOne-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.