Learn

Saturday, 31 October

JEE Main · Chemistry · Some Basic Concepts of Chemistry

Mole and Avogadro Calculations

JEE Main asked Mole and Avogadro Calculations 11 times in 10 of the 108 shifts Lumi analysed, in 2021, 2022, 2023, 2025 and 2026. It belongs to Mole Concept, in Some Basic Concepts of Chemistry (Chemistry). The longest wait between two years asking it was 2 years. In 2021, 2022, 2023 and 2026 it came in more than one shift of the same year.

Updated 2026-10-24

Times asked
11
in 10 shifts
Years
5 of 8
First asked
2021
last in 2026
Pattern
Asked most years
across the analysed shifts

Questions on this idea a shift, by year

2017–2026. Asked in 2021, 2022, 2023, 2025 and 2026. Years differ in how many shifts Lumi analysed, so each year is scaled to one shift of 25 Chemistry questions.

00.20.40’170’200.07’210.10’220.14’230’240.13’250.33’26

Raw count: 2017: 0 in 1 shift · 2020: 0 in 12 shifts · 2021: 2 in 24 shifts · 2022: 3 in 24 shifts · 2023: 2 in 12 shifts · 2024: 0 in 18 shifts · 2025: 1 in 8 shifts · 2026: 3 in 9 shifts.

Shift by shift

Each square is one analysed shift, in date order. Open a filled one for that paper.

  • 20263 of 9
  • 20251 of 8
  • 20240 of 18
  • 20232 of 12
  • 202222 of 24
  • 20212 of 24
  • 20200 of 12
  • 20170 of 1

Asked in that shift More than once Not asked

How JEE Main framed it

Numerical value is the usual form. Skill tested: calculation.

  • Order of total atoms in given amounts
  • Count correct options with equal atoms

Difficulty

Easy 11Medium 0Hard 0

4 of the 11 questions had a numerical answer.

Every question

All 11 questions

From the official JEE Main shift papers, newest first. Open one for the full question, the options and the official answer.

  1. 8 Apr 2026, Shift 2 · Q51Match List - I with List - II. List - I (Mass of substance) | List - II (Number of atoms) A. 1.8 mg water | I.…EasyMatch the list
  2. 6 Apr 2026, Shift 2 · Q51Which of the following contain the same number of atoms ? (Given : Molar mass in g mol−1^{-1} of H, He, O and S are 1, 4, 16 and 32…EasyOther
  3. 4 Apr 2026, Shift 2 · Q51The 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:EasySingle correct
  4. 3 Apr 2025, Shift 1 · Q51Among 10−910^{-9} g (each) of the following elements, which one will have the highest number of atoms? Element: Pb, Po, Pr and PtEasySingle correct
  5. 10 Apr 2023, Shift 2 · Q61Match List I with List II LIST I A. 16 g of CH4\mathrm{CH_4} (g) B. 1 g of H2\mathrm{H_2} (g) C. 1 mole of N2\mathrm{N_2} (g) D. 0.5 mol of…EasyMatch the list
  6. 10 Apr 2023, Shift 1 · Q61The number of molecules and moles in 2.8375 litres of O2\mathrm{O_2} at STP are respectivelyEasySingle correct
  7. 25 Jun 2022, Shift 1 · Q81The number of N atoms in 681 g of C7H5N3O6\mathrm{C_7H_5N_3O_6} is x×1021x \times 10^{21}. The value of xx is __________. (…EasyNumerical value
  8. 25 Jun 2022, Shift 1 · Q90Number of grams of bromine that will completely react with 5.0 g of pent-1-ene is __________ ×10−2\times 10^{-2} g. (Atomic mass of Br = 80…EasyNumerical value
  9. 26 Jul 2022, Shift 2 · Q61Hemoglobin contains 0.34% of iron by mass. The number of Fe atoms in 3.3 g of hemoglobin is (Given: Atomic mass of Fe is 56 u,…EasySingle correct
  10. 18 Mar 2021, Shift 1 · Q51Complete combustion of 3 g of ethane gives x×1022x\times10^{22} molecules of water. The value of xx is __________. (Round off to the Nearest…EasyNumerical value
  11. 17 Mar 2021, Shift 2 · Q51The number of chlorine atoms in 20 mL of chlorine gas at STP is __________102110^{21}. (Round off to the Nearest Integer). [Assume chlorine…EasyNumerical value

Shifts: 17 Mar 2021, Shift 2, 18 Mar 2021, Shift 1, 25 Jun 2022, Shift 1, 26 Jul 2022, Shift 2, 10 Apr 2023, Shift 2, 10 Apr 2023, Shift 1, 3 Apr 2025, Shift 1, 4 Apr 2026, Shift 2, 6 Apr 2026, Shift 2, 8 Apr 2026, Shift 2.

Same topic

Other ideas in Mole Concept

Mole Concept has 18 ideas JEE Main has asked; 12 of them came up in more than one question. The 12 most asked are below.

Topic analysisChapter analysisStudy this chapterAll repeated ideas