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 :

$\mathrm{B}>\mathrm{A}>\mathrm{C}$

$\mathrm{C}>\mathrm{A}>\mathrm{B}$

$\mathrm{C}>\mathrm{B}>\mathrm{A}$

$\mathrm{B}>\mathrm{C}>\mathrm{A}$

Some Basic Concepts Of Chemistry — JEE Main Previous Year Questions

222 solved PYQs · 2016–2026 · Chemistry

Solved PYQs: 222
Years covered: 2016–2026
Avg / year: ~20
Subject: Chemistry

How many JEE Main questions come from Some Basic Concepts Of Chemistry?

Some Basic Concepts Of Chemistry has contributed 222 questions to Joint Entrance Examination (Main) papers between 2016 and 2026 — an average of about 20 questions a year. That count is measured from EByAi’s bank of 55,289 JEE Main questions, not estimated from a syllabus. Every one of the 222 questions carries a written, step-by-step solution, and each is tagged to Some Basic Concepts Of Chemistry within Chemistry, so you can drill this chapter across every year at once instead of hunting through paper PDFs. Practising a chapter’s full PYQ history is the fastest way to learn the patterns examiners reuse.

Sample Some Basic Concepts Of Chemistry questions from real JEE Main papers

These are 5 real questions from the bank — exactly as asked, with the answer one tap away. All 222 Some Basic Concepts Of Chemistry questions (with full written solutions) are available in practice.

Question 1 · JEE Main 2026
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 :
1. (A) $C > A > B$
2. (B) $C > B > A$
3. (C) $B > C > A$
4. (D) $B > A > C$
Show answerAnswer
$Answer: (D) B > A > C$
Question 2 · JEE Main 2026
The mass of iron converted into Fe 3 O 4 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:
1. (A) $2.1 g$
2. (B) $4.2 g$
3. (C) $21 g$
4. (D) $42 g$
Show answerAnswer
$Answer: (D) 42 g$
Question 3 · JEE Main 2026
By usual analysis, 1.00 g of compound (X) gave 1.79 g of magnesium pyrophosphate. The percentage of phosphorus in compound (X) is : (nearest integer) (Given, molar mass in g mol^-1 : O = 16, Mg = 24, P = 31)
1. (A) $40$
2. (B) $30$
3. (C) $20$
4. (D) $50$
Show answerAnswer
$Answer: (D) 50$
Question 4 · JEE Main 2026
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 CO 2 (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)
1. (A) $5.68$
2. (B) $11.44$
3. (C) $22.74$
4. (D) $17.05$
Show answerAnswer
$Answer: (B) 11.44$
Question 5 · JEE Main 2026
Aqueous HCl reacts with MnO 2 (s) to form MnCl 2 (aq), Cl 2 (g), and H 2 O(l). What is the weight (in g) of Cl 2 liberated when 8.7 g of MnO 2 (s) is reacted with excess aqueous HCl solution? (Given Molar mass in g mol −1 Mn = 55, Cl = 35.5, O = 16, H = 1)
1. (A) $14.2$
2. (B) $21.3$
3. (C) $7.1$
4. (D) $71$
Show answerAnswer
$Answer: (C) 7.1$

Some Basic Concepts Of Chemistry questions by year

Year	Questions	Share of chapter questions
2026	19
2025	29
2024	27
2023	34
2022	34
2021	34
2020	19
2019	16
2018	4
2017	4
2016	2

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FAQs

How many JEE Main questions have been asked from Some Basic Concepts Of Chemistry?

EByAi's bank holds 222 real JEE Main questions from Some Basic Concepts Of Chemistry, asked between 2016 and 2026 — about 20 per year on average. Every count is measured from actual papers, not estimated.

Is Some Basic Concepts Of Chemistry important for JEE Main?

222 questions over 11 papers make Some Basic Concepts Of Chemistry a high-weightage chapter in JEE Main Chemistry. The year-wise table above shows exactly how often it appears.

Can I solve Some Basic Concepts Of Chemistry PYQs online for free?

Yes. EByAi lets you solve JEE Main past-year questions in the browser with written solutions — free daily practice, no card needed.

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