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Friday, 9 October

JEE Main Chemistry · Some Basic Concepts of Chemistry

Mole Concept in JEE Main

Mole Concept (Chemistry, Some Basic Concepts of Chemistry) came 25 times in 23 of the 42 JEE Main shifts Lumi analysed, across 12 distinct ideas. 16 of them came in 2024–26; it was last asked in 2026.

Questions
25
in 23 shifts
Ideas asked
12
7 asked more than once
Numerical answer
12
48% of its questions
Pattern
Asked most years
last asked 2026
Questions each year
0481’173’202’211’222’235’243’258’26

In the shifts Lumi analysed for each year.

Difficulty and format
Easy 17Medium 8Hard 0

Format

  • Numerical value12 Q
  • Single correct10 Q
  • Other1 Q
  • Match the list1 Q
  • Two statements1 Q
Ideas inside the topic
12 ideas
Where it sits

Part of Some Basic Concepts of Chemistry, which had 45 questions in all. Mole Concept accounts for 56% of them. In Lumi's JEE taxonomy it belongs to Physical Chemistry.

Some questions sit in other chapters too: Organic Chemistry: Some Basic Principles and Techniques, Solutions.

Every question

All 25 Mole Concept questions

Newest first, each with its options and official answer.

  1. 4 Apr 2026, Shift 1 · Q51Number of moles and number of molecules in 1.41871.4187 L of SO2\mathrm{SO_2} at STP respectively areEasySingle correct
  2. 4 Apr 2026, Shift 1 · Q732.02.0 g of a bromo hydrocarbon (X) was subjected to Carius analysis, gave 3.363.36 g of AgBr. The percentage of carbon in the compound (X)…MediumNumerical value
  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. 5 Apr 2026, Shift 1 · Q54What is the mole fraction of water in 10% by weight (w/w) of aqueous urea solution? [Given: Molar mass of H, O, C and N are 1, 16, 12 and…EasySingle correct
  5. 6 Apr 2026, Shift 1 · Q51An oxide of iron contains 69.9% iron, its empirical formula, is: (Given : Molar mass of Fe and O are 56 and 16 g mol−1^{-1} respectively.)EasySingle correct
  6. 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
  7. 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
  8. 8 Apr 2026, Shift 2 · Q52Given below are two statements : Given : Molar mass of C, H, O, Cl are 12, 1, 16 and 35.5 g mol−1^{-1}, respectively Statement I : In 30%…MediumTwo statements
  9. 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
  10. 3 Apr 2025, Shift 2 · Q5410 mL of 2 M NaOH solution is added to 20 mL of 1 M HCl solution kept in a beaker. Now, 10 mL of this mixture is poured into a volumetric…MediumSingle correct
  11. 4 Apr 2025, Shift 2 · Q73Sea water, which can be considered as a 6 molar (6 M) solution of NaCl, has a density of 2 g mL−12\ \mathrm{g\,mL^{-1}}. The concentration of…MediumNumerical value
  12. 6 Apr 2024, Shift 2 · Q61Molality (mm) of 3 M aqueous solution of NaCl is : (Given : Density of solution =1.25 g mL−1=1.25\ \mathrm{g\,mL^{-1}}, Molar mass in…EasySingle correct
  13. 9 Apr 2024, Shift 1 · Q81Molarity (M) of an aqueous solution containing xx g of anhyd. CuSO4\mathrm{CuSO_4} in 500 mL solution at 32 ∘^\circC is 2×10−12\times10^{-1} M.…MediumNumerical value
  14. 29 Jan 2024, Shift 1 · Q81A solution of H2SO4\mathrm{H_2SO_4} is 31.4% H2SO4\mathrm{H_2SO_4} by mass and has a density of 1.25g/mL. The molarity of the H2SO4\mathrm{H_2SO_4}…EasyNumerical value
  15. 30 Jan 2024, Shift 2 · Q61If a substance 'A' dissolves in solution of a mixture of 'B' and 'C' with their respective number of moles as nA\mathrm{n_A},…EasySingle correct
  16. 31 Jan 2024, Shift 2 · Q83The molarity of 1 L orthophosphoric acid (H3PO4\mathrm{H_3PO_4}) having 70% purity by weight (specific gravity 1.54 g cm−3^{-3}) is _________…EasyNumerical value
  17. 6 Apr 2023, Shift 1 · Q81If 5 moles of BaCl2\mathrm{BaCl_2} is mixed with 2 moles of Na3PO4\mathrm{Na_3PO_4}, the maximum number of moles of Ba3(PO4)2\mathrm{Ba_3(PO_4)_2}…EasyNumerical value
  18. 11 Apr 2023, Shift 1 · Q81A solution of sugar is obtained by mixing 200g of its 25% solution and 500g of its 40% solution (both by mass). The mass percentage of the…EasyNumerical value
  19. 28 Jul 2022, Shift 1 · Q81In the given reaction, X+Y+3Z⇌XYZ3\mathrm{X+Y+3Z\rightleftharpoons XYZ_3} if one mole of each of X and Y with 0.05 mol of Z gives compound…MediumNumerical value
  20. 3 Aug 2021, Shift 2 · Q51Chlorine is prepared according to the following equation :…MediumNumerical value
  21. 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
  22. 8 Jan 2020, Shift 1 · Q46Ferrous sulphate heptahydrate is used to fortify foods with iron. The amount (in grams) of the salt required to achieve 10 ppm of iron in…MediumNumerical value
  23. 9 Jan 2020, Shift 2 · Q4710.30 mg of O2\mathrm{O_2} is dissolved into a liter of sea water of density 1.03 g/mL. The concentration of O2\mathrm{O_2} in ppm is…EasyNumerical value
  24. 6 Sep 2020, Shift 2 · Q40The average molar mass of chlorine is 35.5 g mol−135.5\ \mathrm{g\,mol^{-1}}. The ratio of 35Cl^{35}\mathrm{Cl} to 37Cl^{37}\mathrm{Cl} in naturally…EasySingle correct
  25. 2 Apr 2017 (offline) · Q321 gram of a carbonate (M2CO3\mathrm{M_2CO_3}) on treatment with excess HCl produces 0.01186 mole of CO2\mathrm{CO_2}. The molar mass of…EasySingle correct