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Saturday, 31 October

JEE Main · Chemistry · Some Basic Concepts of Chemistry

Limiting Reagent Identification

JEE Main asked Limiting Reagent Identification 8 times in 8 of the 108 shifts Lumi analysed, in 2021, 2022, 2025 and 2026. It belongs to Stoichiometry, in Some Basic Concepts of Chemistry (Chemistry). The longest wait between two years asking it was 3 years. In 2021, 2022 and 2025 it came in more than one shift of the same year.

Updated 2026-10-24

Times asked
8
in 8 shifts
Years
4 of 8
First asked
2021
last in 2026
Pattern
Frequent
across the analysed shifts

Questions on this idea a shift, by year

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

00.150.30’170’200.07’210.10’220’230’240.25’250.11’26

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

Shift by shift

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

  • 20261 of 9
  • 20252 of 8
  • 20240 of 18
  • 20230 of 12
  • 20223 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.

  • Product mass with limiting reagent
  • Gas volume from impure reagent

Difficulty

Easy 3Medium 5Hard 0

4 of the 8 questions had a numerical answer.

Every question

All 8 questions

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

  1. 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
  2. 7 Apr 2025, Shift 2 · Q71Butane reacts with oxygen to produce carbon dioxide and water following the equation given below.…EasyNumerical value
  3. 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
  4. 30 Jun 2022, Shift 1 · Q81Blister copper is produced by reaction of copper oxide with copper sulphide.…MediumNumerical value
  5. 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
  6. 29 Jul 2022, Shift 1 · Q62N2(g)+3H2(g)⇌2NH3(g)\mathrm{N_{2(g)}+3H_{2(g)} \rightleftharpoons 2NH_{3(g)}} 20 g 5 g Consider the above reaction, the limiting reagent of the reaction and…EasySingle correct
  7. 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
  8. 27 Aug 2021, Shift 2 · Q51100 g of propane is completely reacted with 1000 g of oxygen. The mole fraction of carbon dioxide in the resulting mixture is…MediumNumerical value

Shifts: 16 Mar 2021, Shift 2, 27 Aug 2021, Shift 2, 29 Jun 2022, Shift 1, 30 Jun 2022, Shift 1, 29 Jul 2022, Shift 1, 2 Apr 2025, Shift 1, 7 Apr 2025, Shift 2, 5 Apr 2026, Shift 2.

Same topic

Other ideas in Stoichiometry

Stoichiometry has 24 ideas JEE Main has asked; 13 of them came up in more than one question. The 12 most asked are below.

Topic analysisChapter analysisStudy this chapterAll repeated ideas