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Friday, 9 October

JEE Main Chemistry · Some Basic Concepts of Chemistry

Stoichiometry in JEE Main

Stoichiometry (Chemistry, Some Basic Concepts of Chemistry) came 38 times in 25 of the 42 JEE Main shifts Lumi analysed, across 16 distinct ideas. 24 of them came in 2024–26; it was last asked in 2026.

Questions
38
in 25 shifts
Ideas asked
16
8 asked more than once
Numerical answer
21
55% of its questions
Pattern
Asked most years
last asked 2026
Questions each year
07140’171’204’217’222’233’2413’258’26

In the shifts Lumi analysed for each year.

Difficulty and format
Easy 21Medium 17Hard 0

Format

  • Numerical value21 Q
  • Single correct16 Q
  • Match the list1 Q
Ideas inside the topic
16 ideas
Where it sits

Part of Some Basic Concepts of Chemistry, which had 45 questions in all. Stoichiometry accounts for 84% of them. In Lumi's JEE taxonomy it belongs to Physical Chemistry.

Some questions sit in other chapters too: Aldehydes, Ketones and Carboxylic Acids, Haloalkanes and Haloarenes, Organic Chemistry: Some Basic Principles and Techniques.

Every question

All 38 Stoichiometry questions

Newest first, each with its options and official answer.

  1. 2 Apr 2026, Shift 1 · Q51The mass of iron converted into Fe3O4\mathrm{Fe_3O_4} by the action of 1818 g of steam is : (Given : Molar mass of H, O and Fe are 1,161, 16…EasySingle correct
  2. 2 Apr 2026, Shift 2 · Q51The 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)CO_2(g) formed…MediumSingle correct
  3. 2 Apr 2026, Shift 2 · Q62Complete combustion of X g of an organic compound gave 0.25 g of CO2CO_2 and 0.12 g of H2OH_2O. If the % of carbon is 25% and of hydrogen is…MediumSingle correct
  4. 2 Apr 2026, Shift 2 · Q75Consider the following reactions sequence…MediumNumerical value
  5. 4 Apr 2026, Shift 2 · Q75In sulphur estimation, 2.0×10−32.0\times10^{-3} mol of an organic compound (X) (molar mass 76 g mol−1\mathrm{g\ mol^{-1}}) gave 0.4813 g of barium…EasyNumerical value
  6. 5 Apr 2026, Shift 1 · Q51How many grams of residue is obtained by heating 2.76 g of silver carbonate? (Given : Molar mass of C, O and Ag are 12, 16 and 108 g…EasySingle correct
  7. 5 Apr 2026, Shift 1 · Q72In an estimation of sulphur by Carius method 0.2 g of the substance gave 0.6 g of BaSO4\mathrm{BaSO_4}. The percentage of sulphur in the…EasyNumerical value
  8. 5 Apr 2026, Shift 2 · Q51What volume of hydrogen gas at STP would be liberated by action of 50 mL of H2SO4\mathrm{H_2SO_4} of 50% purity (density = 1.3 g mL−1^{-1})…MediumSingle correct
  9. 2 Apr 2025, Shift 1 · Q51CaCO3(s)+2HCl(aq)→CaCl2(aq)+CO2(g)+H2O(l)\mathrm{CaCO_3(s)+2HCl(aq)\rightarrow CaCl_2(aq)+CO_2(g)+H_2O(l)} Consider the above reaction, what mass of CaCl2\mathrm{CaCl_2} will be…MediumSingle correct
  10. 2 Apr 2025, Shift 1 · Q63On complete combustion 1.0 g of an organic compound (X) gave 1.46 g of CO2\mathrm{CO_2} and 0.567 g of H2O\mathrm{H_2O}. The empirical…MediumSingle correct
  11. 2 Apr 2025, Shift 2 · Q64In Dumas' method for estimation of nitrogen, 0.5 gram of an organic compound gave 60 mL of nitrogen collected at 300 K temperature and 715…MediumSingle correct
  12. 3 Apr 2025, Shift 1 · Q740.5 g of an organic compound on combustion gave 1.46 g of CO2\mathrm{CO_2} and 0.9 g of H2O\mathrm{H_2O}. The percentage of carbon in the…EasyNumerical value
  13. 3 Apr 2025, Shift 1 · Q75During estimation of nitrogen by Dumas' method of compound X (0.42 g) [structure X: piperazine, six-membered ring with two NH groups at…EasyNumerical valueHas a figure
  14. 3 Apr 2025, Shift 2 · Q51Mass of magnesium required to produce 220 mL of hydrogen gas at STP on reaction with excess of dil. HCl is Given: Molar mass of Mg is…EasySingle correct
  15. 3 Apr 2025, Shift 2 · Q64In Dumas' method for estimation of nitrogen 0.4 g of an organic compound gave 60 mL of nitrogen collected at 300 K temperature and 715 mm…MediumSingle correct
  16. 4 Apr 2025, Shift 2 · Q74The amount of calcium oxide produced on heating 150 kg limestone (75% pure) is __________ kg. (Nearest integer) Given : Molar mass (in…EasyNumerical value
  17. 7 Apr 2025, Shift 1 · Q74An organic compound weighing 500 mg, produced 220 mg of CO2\mathrm{CO_2}, on complete combustion. The percentage composition of carbon in…EasyNumerical value
  18. 7 Apr 2025, Shift 2 · Q71Butane reacts with oxygen to produce carbon dioxide and water following the equation given below.…EasyNumerical value
  19. 7 Apr 2025, Shift 2 · Q74In Dumas' method 292 mg of an organic compound released 50 mL of nitrogen gas (N2\mathrm{N_2}) at 300 K temperature and 715 mm Hg…MediumNumerical value
  20. 8 Apr 2025, Shift 2 · Q62On combustion 0.210 g of an organic compound containing C, H and O gave 0.127 g H2O\mathrm{H_2O} and 0.307 g CO2\mathrm{CO_2}. The…MediumSingle correct
  21. 8 Apr 2025, Shift 2 · Q7120 mL of sodium iodide solution gave 4.74 g silver iodide when treated with excess of silver nitrate solution. The molarity of the sodium…EasyNumerical value
  22. 8 Apr 2024, Shift 1 · Q61Combustion of glucose (C6H12O6\mathrm{C_6H_{12}O_6}) produces CO2\mathrm{CO_2} and water. The amount of oxygen (in g) required for the complete…EasySingle correct
  23. 31 Jan 2024, Shift 1 · Q81Number of moles of methane required to produce 22g CO2(g)\mathrm{CO_{2(g)}} after combustion is x×10−2\mathrm{x}\times10^{-2} moles. The value of…EasyNumerical value
  24. 31 Jan 2024, Shift 2 · Q61A sample of CaCO3\mathrm{CaCO_3} and MgCO3\mathrm{MgCO_3} weighed 2.21 g is ignited to constant weight of 1.152 g. The composition of mixture is…MediumSingle correct
  25. 13 Apr 2023, Shift 2 · Q811g of a carbonate (M2CO3\mathrm{M_2CO_3}) on treatment with excess HCl produces 0.01 mol of CO2\mathrm{CO_2}. The molar mass of…EasyNumerical value
  26. 13 Apr 2023, Shift 2 · Q900.400 g of an organic compound (X) gave 0.376 g of AgBr in Carius method for estimation of bromine. % of bromine in the compound (X) is…EasyNumerical value
  27. 25 Jul 2022, Shift 1 · Q61SO2Cl2\mathrm{SO_2Cl_2} on reaction with excess of water results into acidic mixture SO2Cl2+2H2O→H2SO4+2HCl\mathrm{SO_2Cl_2+2H_2O\rightarrow H_2SO_4+2HCl} 1616…EasySingle correct
  28. 25 Jul 2022, Shift 1 · Q88While estimating the nitrogen present in an organic compound by Kjeldahl's method, the ammonia evolved from 0.250.25 g of the compound…EasyNumerical value
  29. 28 Jul 2022, Shift 1 · Q90On complete combustion of 0.492 g of an organic compound containing C, H and O, 0.7938 g of CO2\mathrm{CO_2} and 0.4428 g of…EasyNumerical value
  30. 24 Jun 2022, Shift 1 · Q61If a rocket runs on a fuel (C15H30\mathrm{C_{15}H_{30}}) and liquid oxygen, the weight of oxygen required and CO2\mathrm{CO_2} released for…MediumSingle correct
  31. 24 Jun 2022, Shift 1 · Q88A 0.166 g sample of an organic compound was digested with conc. H2SO4\mathrm{H_2SO_4} and then distilled with NaOH. The ammonia gas evolved…MediumNumerical value
  32. 29 Jun 2022, Shift 1 · Q61Production of iron in blast furnace follows the following equation Fe3O4(s)+4CO(g)→3Fe(l)+4CO2(g)\mathrm{Fe_3O_4(s) + 4CO(g) \rightarrow 3Fe(l) + 4CO_2(g)} when 4.640…EasySingle correct
  33. 29 Jun 2022, Shift 1 · Q88Kjeldahl's method was used for the estimation of nitrogen in an organic compound. The ammonia evolved from 0.55 g of the compound…EasyNumerical value
  34. 25 Jul 2021, Shift 1 · Q59Consider the complete combustion of butane, the amount of butane utilized to produce 72.0 g of water is ________×10−1\times10^{-1} g. (in…EasyNumerical value
  35. 16 Mar 2021, Shift 2 · Q51When 35 mL of 0.15 M lead nitrate solution is mixed with 20 mL of 0.12 M chromic sulphate solution, ________ ×10−5\times10^{-5} moles of lead…MediumNumerical value
  36. 16 Mar 2021, Shift 2 · Q60In Duma's method of estimation of nitrogen, 0.1840 g of an organic compound gave 30 mL of nitrogen collected at 287 K and 758 mm of Hg…MediumNumerical value
  37. 18 Mar 2021, Shift 1 · Q59__________ grams of 3-Hydroxy propanal (MW = 74) must be dehydrated to produce 7.8 g of acrolein (MW = 56) (C3H4O\mathrm{C_3H_4O}) if the…MediumNumerical value
  38. 6 Sep 2020, Shift 2 · Q32Match the following : Test / Method — Reagent (i) Lucas Test (a) C6H5SO2Cl\mathrm{C_6H_5SO_2Cl} / aq. KOH (ii) Dumas method (b) HNO3\mathrm{HNO_3}…MediumMatch the list