Mole Concept & Stoichiometry JEE Main PYQs PDF, 2020–2026

Mole Concept & Stoichiometry has 206 questions in JEE Main papers from 2020 to 2026, about 29 per year across all shifts. The free PDF has 201 of them, each with its answer. The most asked topic is Stoichiometry (84 questions), followed by Concentration Terms (49) and Atomic and Molar Mass (23).

Asked in JEE Main: 2062020–2026, all shifts
In this free PDF: 201with answers
Asked in 2026: 24Latest paper: 2026 Apr S2
Most asked topic: Stoichiometry84 Qs · 41% of the chapter
Difficulty mix: 72% easy · 28% mediumof the questions in the PDF

Answer key includedNo loginPractise online

Source: official NTA JEE Main papers · Updated 17 Oct 2026

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8 of this chapter's questions came back in a later paper (2021–2026). See the most repeated.

How often it's asked in JEE Main

Mole Concept & Stoichiometry had about 1.3 questions per shift in recent JEE Main papers (2024–26). It's one of the most asked Chemistry chapters. Most asked topic: Stoichiometry. About 24 questions in the 2026 papers.

It came up in almost every 2024–26 shift in our bank (about 56 shifts). Question types in 2020–2026: about 72 MCQs and about 134 numerical.

How many questions from Mole Concept & Stoichiometry in JEE Main, year by year

Year	Questions	Per shift	MCQ	Numerical
2026	24	1.3	20	4
2025	30	1.6	11	19
2024	35	1.8	13	22
2023	30	1.3	10	20
2022	35	1.5	11	24
2021	32	1.2	0	32
2020	20	1.3	7	13
2020–2026	206	1.4	72	134

Most asked Mole Concept & Stoichiometry topics, 2020–2026

Topic	Questions
Stoichiometry	84
Concentration Terms	49
Atomic and Molar Mass	23
Empirical and Molecular Formula	21
Percentage Yield and Purity	15

Every topic, year by year, is in the topic-wise table further down.

Counted from PrepWiser's question bank of JEE Main papers, 2020–2026. Per shift = questions that year ÷ shifts in our bank. Updated 17 Oct 2026.

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Two free sheets, made from the past JEE Main questions on this chapter.

Revision notes10 pages, 26 ideas with the usual mistakes.Open the revision notes Formula sheet2 pages, all 25 formulas.Open the formula sheet

Mole Concept & Stoichiometry questions per year

Year	Asked	In PDF
2026	24	24
2025	30	29
2024	35	35
2023	30	29
2022	35	34
2021	32	32
2020	20	18

in the free PDF asked, not in the PDFThe PDF only has questions we can print in full with a checked answer, so it holds 201 of the 206 asked.

Topic-wise weightage by year

How many Mole Concept & Stoichiometry questions each topic had in every JEE Main year (all shifts), counting every question asked, including ones not in the PDF. Darker cells mean more questions.

Topic	Asked	Share	2026	2025	2024	2023	2022	2021	2020
Stoichiometry	84	41%	9	11	18	14	14	9	9
Concentration Terms	49	24%	2	4	11	9	6	10	7
Atomic and Molar Mass	23	11%	4	4	3	2	4	4	2
Empirical and Molecular Formula	21	10%	3	5	1	4	4	2	2
Percentage Yield and Purity	15	7%	3	2	1	·	3	6	·
Limiting Reagent	14	7%	3	4	1	1	4	1	·
All topics	206	100%	24	30	35	30	35	32	20

Swipe the table sideways for older years.

Newest questions (2026)

The 12 newest of the 24 JEE Main 2026 Mole Concept & Stoichiometry questions in the free PDF, latest shift first.

JEE Main 2026 · 8 Apr · Shift 2 · Atomic and Molar Mass

$\text{ Match List - I with List - II.}$

List - I Mass of substance		List - II Number of atoms
A.	1.8 mg water	I.	$2\times {10}^{{-4}}\times {\mathrm{N}}_{{{\mathrm{A}}}}$
B.	9.8 mg sulphuric acid	II.	$1.5\times {10}^{{-4}}\times {\mathrm{N}}_{{{\mathrm{A}}}}$
C.	1.8 mg carbon	III.	$3\times {10}^{{-4}}\times {\mathrm{N}}_{{{\mathrm{A}}}}$
D.	5.85 mg salt $({\mathrm{NaCl}})$	IV.	$7\times {10}^{{-4}}\times {\mathrm{N}}_{{{\mathrm{A}}}}$

$\text{ Choose the correct answer from the options given below:}$

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JEE Main 2026 · 6 Apr · Shift 1 · Percentage Yield and Purity

4.7 g of phenol is heated with Zn to give product X . If this reaction goes to $60\%$ completion then the number of moles of compound X formed will be

$\_\_\_\_$ $\times {10}^{{-2}}$ .(Nearest Integer)

(Given molar mass in ${\mathrm{g}}{\mathrm{mol}}^{{-1}}:{\mathrm{H}}:1,{\mathrm{C}}:12,{\mathrm{O}}:16$ )
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JEE Main 2026 · 6 Apr · Shift 2 · Atomic and Molar Mass

Which of the following contain the same number of atoms?

(Given : Molar mass in ${\mathrm{g}}{\mathrm{mol}}^{{-1}}$ of ${\mathrm{H}},{\mathrm{He}},{\mathrm{O}}$ and S are 1, 4, 16 and 32 respectively)

A. 2 g of ${\mathrm{O}}_{2}$ gas

B. 4 g of ${\mathrm{SO}}_{2}$ gas

C. 1400 mL of ${\mathrm{O}}_{2}$ at STP

D. $0.05{\ \mathrm{L}}$ of He at STP

E. $0.0625{\ \mathrm{mol}}$ of ${\mathrm{H}}_{2}$ gas

Choose the correct answer from the options given below :

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JEE Main 2026 · 6 Apr · Shift 1 · Empirical and Molecular Formula

An oxide of iron contains $69.9\%$ iron, its empirical formula, is :

(Given : Molar mass of Fe and O are 56 and $16{\ \mathrm{g}}{\ \mathrm{mol}}^{{-1}}$ respectively.)

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JEE Main 2026 · 5 Apr · Shift 1 · Concentration Terms

What is the mole fraction of water in $10\%$ by weight $({\mathrm{w}}/{\mathrm{w}})$ of aqueous urea solution?

[Given: Molar mass of ${\mathrm{H}},{\mathrm{O}},{\mathrm{C}}$ and N are $1,16,12$ and $14{\ \mathrm{g}}{\ \mathrm{mol}}^{{-1}}$ respectively.]

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JEE Main 2026 · 5 Apr · Shift 1 · Stoichiometry

How many grams of residue is obtained by heating 2.76 g of silver carbonate?

(Given : Molar mass of ${\mathrm{C}},{\mathrm{O}}$ and Ag are 12, 16 and $108{\ \mathrm{g}}{\ \mathrm{mol}}^{{-1}}$ respectively)
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JEE Main 2026 · 5 Apr · Shift 2 · Limiting Reagent

What volume of hydrogen gas at STP would be liberated by action of 50 mL of ${\mathrm{H}}_{2}{\mathrm{SO}}_{4}$ of $50\%$ purity (density $=1.3{\ \mathrm{g}}{\ \mathrm{mL}}^{{-1}}$ ) on 20 g of zinc?

Given : Molar mass of ${\mathrm{H}},{\mathrm{O}},{\mathrm{S}},{\mathrm{Zn}}$ are 1, 16, 32, $65{\ \mathrm{g}}{\ \mathrm{mol}}^{{-1}}$ respectively.

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JEE Main 2026 · 4 Apr · Shift 2 · Atomic and Molar Mass

The correct order of total number of atoms present in

(A) 2 moles of cyclohexane

(B) 684 g of sucrose

(C) 90.8 L of dihydrogen at STP

is :

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JEE Main 2026 · 4 Apr · Shift 1 · Atomic and Molar Mass

Number of moles and number of molecules in 1.4187 L of ${\mathrm{SO}}_{2}$ at STP respectively are

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JEE Main 2026 · 2 Apr · Shift 2 · Stoichiometry

The ratio of mass percentage (w/w) of C : H in a hydrocarbon is 12 : 1. It has two carbon atoms. The weight (in g) of CO₂(g) formed when 3.38 g of this hydrocarbon is completely burnt in oxygen is :

(Given : Molar mass in g mol^–1 C : 12, H : 1, O : 16)
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JEE Main 2026 · 2 Apr · Shift 1 · Stoichiometry

The mass of iron converted into Fe₃O₄ by the action of 18 g of steam is:

(Given: Molar mass of H, O and Fe are 1, 16 and 56 g mol⁻¹ respectively)

Assume iron is present in excess:
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JEE Main 2026 · 28 Jan · Shift 2 · Limiting Reagent

For the given reaction;
CaCO₃ + 2HCl → CaCl₂ + H₂O + CO₂
If 90 g CaCO₃ is added to 300 mL of HCl which contains 38.55% HCl by mass and has density 1.13 g mL⁻¹, then which of the following option is correct?
Given molar mass of H, Cl, Ca and O are 1, 35.5, 40 and 16 g mol⁻¹ respectively.
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Sample questions from recent papers

JEE Main 2026 · 24 Jan · Shift 2 · Percentage Yield and Purity

A student has planned to prepare acetanilide from aniline using acetic anhydride.

The student has started from 9.3 g of aniline. However, the student has managed to obtain 11 g of dry acetanilide.

The % yield of this reaction is :-

(A)
59.5%
(B)
$72.5$
(C)
$97.5$
(D)
81.5%

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Answer: (D)

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JEE Main 2026 · 22 Jan · Shift 2 · Concentration Terms

At ${\mathrm{T}}({\mathrm{K}}),100{\ \mathrm{g}}$ of $98\%{\mathrm{H}}_{2}{\mathrm{SO}}_{4}({\mathrm{w}}/{\mathrm{w}})$ aqueous solution is mixed with 100 g of $49\%{\mathrm{H}}_{2}{\mathrm{SO}}_{4}({\mathrm{w}}/{\mathrm{w}})$ aqueous solution. What is the mole fraction of ${\mathrm{H}}_{2}{\mathrm{SO}}_{4}$ in the resultant solution?

(Given : Atomic mass ${\mathrm{H}}=1{\mathrm{u}};{\mathrm{S}}=32{\mathrm{u}};{\mathrm{O}}=16{\mathrm{u}}$ ).

(Assume that temperature after mixing remains constant)

(A)
0.9
(B)
0.663
(C)
0.1
(D)
0.337

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Answer: (D)

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JEE Main 2026 · 22 Jan · Shift 1 · Empirical and Molecular Formula

The cycloalkene $({\mathrm{X}})$ on bromination consumes one mole of bromine per mole of $({\mathrm{X}})$ and gives the product $({\mathrm{Y}})$ in which ${\mathrm{C}}:{\mathrm{Br}}$ ratio is 3:1. The percentage of bromine in the product $({\mathrm{Y}})$ is $\_\_\_\_$ %. (Nearest integer)

(Given : molar mass in ${\mathrm{g}}{\mathrm{mol}}^{{-1}}{\mathrm{H}}:1,{\mathrm{C}}:12,{\mathrm{O}}:16,{\mathrm{Br}}:80$ )

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Answer: 66

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JEE Main 2026 · 22 Jan · Shift 2 · Limiting Reagent

${\mathrm{A}}+2{\ \mathrm{B}}\longrightarrow {\mathrm{AB}}_{2}$

36.0 g of 'A' (Molar mass : $60{\ \mathrm{g}}{\ \mathrm{mol}}^{{-1}}$ ) and 56.0 g of ' B ' (Molar mass : $80{\ \mathrm{g}}{\ \mathrm{mol}}^{{-1}}$ ) are allowed to react. Which of the following statements are correct ?

A. 'A' is the limiting reagent.

B. $77.0{\ \mathrm{g}}$ of ${\mathrm{AB}}_{2}$ is formed.

C. Molar mass of ${\mathrm{AB}}_{2}$ is $140{\ \mathrm{g}}{\ \mathrm{mol}}^{{-1}}$ .

D. $15.0{\ \mathrm{g}}$ of A is left unreacted after the completion of reaction.

Choose the correct answer from the options given below :

(A)
A and C Only
(B)
A and B Only
(C)
C and D Only
(D)
B and D Only

Show answer

Answer: (D)

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Frequently asked

How many questions come from Mole Concept & Stoichiometry in JEE Main?

206 questions from 2020 to 2026, about 29 per year. In 2026 it had 24. The free PDF has 201 of them.

Which Mole Concept & Stoichiometry topics are most important for JEE Main?

By past papers: Stoichiometry (41%), Concentration Terms (24%) and Atomic and Molar Mass (11%) of all Mole Concept & Stoichiometry questions.

Is the Mole Concept & Stoichiometry PYQ PDF free?

Yes. The PDF and its answer key are free, and you can practise the questions online with no login, with step-by-step solutions where available.

Prefer to solve online? Practise Mole Concept & Stoichiometry online with step-by-step solutions where available, or work through JEE Main papers shift by shift.

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JEE Main PYQs by year: 2026 · 2025 · 2024 · 2023 · 2022 · 2021 · 2020

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Answers follow NTA's final answer keys. Typing errors are possible, so check doubtful answers against the official key. Spotted a mistake? prepwiser.in/feedback · Terms: prepwiser.in/terms

Mole Concept & Stoichiometry JEE Main PYQs PDF, 2020–2026

How often it's asked in JEE Main

How many questions from Mole Concept & Stoichiometry in JEE Main, year by year

Most asked Mole Concept & Stoichiometry topics, 2020–2026

Revise Mole Concept & Stoichiometry before you practise

Send this chapter to your study group

Mole Concept & Stoichiometry questions per year

Topic-wise weightage by year

Newest questions (2026)

Sample questions from recent papers

Practise these online, free, no login

Frequently asked

How many questions come from Mole Concept & Stoichiometry in JEE Main?

Which Mole Concept & Stoichiometry topics are most important for JEE Main?

Is the Mole Concept & Stoichiometry PYQ PDF free?

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