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Saturday, 31 October

JEE Main · Chemistry · Some Basic Concepts of Chemistry

Stoichiometry of Thermal Decomposition

JEE Main asked Stoichiometry of Thermal Decomposition 2 times in 2 of the 108 shifts Lumi analysed, in 2021 and 2026. It belongs to Stoichiometry, in Some Basic Concepts of Chemistry (Chemistry). The longest wait between two years asking it was 5 years.

Updated 2026-10-24

Times asked
2
in 2 shifts
Years
2 of 8
First asked
2021
last in 2026
Pattern
Occasional
across the analysed shifts

Questions on this idea a shift, by year

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

00.10.20’170’200.03’210’220’230’240’250.11’26

Raw count: 2017: 0 in 1 shift · 2020: 0 in 12 shifts · 2021: 1 in 24 shifts · 2022: 0 in 24 shifts · 2023: 0 in 12 shifts · 2024: 0 in 18 shifts · 2025: 0 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
  • 20250 of 8
  • 20240 of 18
  • 20230 of 12
  • 20220 of 24
  • 20211 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.

  • Residue mass on heating salt
  • Mass of reactant from volume of gas at stp

Difficulty

Easy 2Medium 0Hard 0

1 of the 2 questions had a numerical answer.

Every question

All 2 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 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
  2. 4 Aug 2021, Shift 2 · Q51The amount of potassium chlorate (KClO3\mathrm{KClO_3}) that needs to be completely decomposed in order to liberate 40 dm3\mathrm{dm^3} of…EasyNumerical value

Shifts: 4 Aug 2021, Shift 2, 5 Apr 2026, Shift 1.

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