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Friday, 9 October

JEE Main Chemistry · Class 11

Some Basic Concepts of Chemistry: JEE Main previous year questions

Some Basic Concepts of Chemistry had 45 questions in the 42 JEE Main shifts Lumi analysed, about 0.9 a shift, asked in 38 of 42 shifts. It ranks 16 of 30 Chemistry chapters by questions; 0% of its questions were hard.

Questions
45
in 38 of 42 shifts
A shift, on average
0.9
of 25 Chemistry questions
Since 2024
+0.2
0.9 a shift in 2017–23, 1.1 in 2024–26
Numerical answer
15
33% of its questions

Year by year

How often it came

Questions in the analysed shifts of each year. Years differ in how many shifts Lumi analysed, so read the bars with the shift count.

Questions each year
06121’174’205’214’223’237’2411’2510’26

2017: 1 shifts · 2020: 4 shifts · 2021: 4 shifts · 2022: 4 shifts · 2023: 4 shifts · 2024: 8 shifts · 2025: 8 shifts · 2026: 9 shifts

Difficulty by year
  • 20171
  • 20204
  • 20215
  • 20224
  • 20233
  • 20247
  • 202511
  • 202610
  • Easy
  • Medium
  • Hard

Inside the chapter

Topics and the ideas that repeat

4 topics and 20 distinct ideas; 8 ideas were asked more than once. Most questions are single correct and calculation.

Topics, by questions

6 questions had no close topic in our taxonomy and are counted for the chapter only.

Ideas asked most
8 repeat

Study it on Lumi

Some Basic Concepts of Chemistry: the interactive lesson

Every question

All 45 Some Basic Concepts of Chemistry questions

Newest first. Each opens with its options and the official answer.

2026 10 questions

  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. 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
  5. 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
  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 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
  8. 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
  9. 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
  10. 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

2025 11 questions

  1. 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
  2. 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
  3. 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
  4. 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
  5. 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
  6. 3 Apr 2025, Shift 2 · Q63Compounds that should not be used as primary standards in titrimetric analysis are : A. Na2Cr2O7\mathrm{Na_2Cr_2O_7} B. Oxalic acid C. NaOH D.…MediumOther
  7. 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
  8. 7 Apr 2025, Shift 1 · Q51At the sea level, the dry air mass percentage composition is given as nitrogen gas: 70.0, oxygen gas: 27.0 and argon gas: 3.0. If total…MediumSingle correct
  9. 7 Apr 2025, Shift 2 · Q71Butane reacts with oxygen to produce carbon dioxide and water following the equation given below.…EasyNumerical value
  10. 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
  11. 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

2024 7 questions

  1. 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
  2. 9 Apr 2024, Shift 1 · Q80Identify the incorrect statements regarding primary standard of titrimetric analysis. (A) It should be purely available in dry form. (B)…MediumOther
  3. 9 Apr 2024, Shift 2 · Q61The candela is the luminous intensity, in a given direction, of a source that emits monochromatic radiation of frequency 'AA'…EasySingle correct
  4. 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
  5. 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
  6. 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
  7. 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

2023 3 questions

  1. 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
  2. 8 Apr 2023, Shift 2 · Q61Which of the following have same number of significant figures? A. 0.00253 B. 1.0003 C. 15.0 D. 163 Choose the correct answer from the…EasyOther
  3. 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

2022 4 questions

  1. 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
  2. 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
  3. 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
  4. 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

2021 5 questions

  1. 3 Aug 2021, Shift 2 · Q51Chlorine is prepared according to the following equation :…MediumNumerical value
  2. 25 Jul 2021, Shift 1 · Q51When 10 mL of an aqueous solution of Fe2+\mathrm{Fe^{2+}} ions was titrated in the presence of dil H2SO4\mathrm{H_2SO_4} using diphenylamine…MediumNumerical value
  3. 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
  4. 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
  5. 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

2020 4 questions

  1. 8 Jan 2020, Shift 1 · Q33The strength of an aqueous NaOH solution is most accurately determined by titrating : (Note : consider that an appropriate indicator is…MediumSingle correct
  2. 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
  3. 2 Sep 2020, Shift 1 · Q33While titrating dilute HCl solution with aqueous NaOH, which of the following will not be required ?EasySingle correct
  4. 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

2017 1 questions

  1. 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

Pattern: Asked most years.