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Saturday, 31 October

JEE Main · Chemistry · The d- and f-Block Elements

HCl Limitation in KMnO4 Titrations

JEE Main asked HCl Limitation in KMnO4 Titrations 2 times in 2 of the 108 shifts Lumi analysed, in 2020 and 2022. It belongs to d-Block Elements, in The d- and f-Block Elements (Chemistry). The longest wait between two years asking it was 2 years.

Updated 2026-10-24

Times asked
2
in 2 shifts
Years
2 of 8
First asked
2020
last in 2022
Pattern
Occasional
across the analysed shifts

Questions on this idea a shift, by year

2017–2026. Asked in 2020 and 2022. Years differ in how many shifts Lumi analysed, so each year is scaled to one shift of 25 Chemistry questions.

00.050.10’170.08’200’210.03’220’230’240’250’26

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

Shift by shift

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

  • 20260 of 9
  • 20250 of 8
  • 20240 of 18
  • 20230 of 12
  • 20221 of 24
  • 20210 of 24
  • 20201 of 12
  • 20170 of 1

Asked in that shift More than once Not asked

How JEE Main framed it

Assertion–reason is the usual form. Skill tested: conceptual.

  • Assertion-reason on permanganate titration
  • Count incorrect statements on d- and f-block elements

Difficulty

Easy 1Medium 1Hard 0

Every question was multiple choice.

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. 28 Jul 2022, Shift 2 · Q39Given below are two statements : One is labelled as **Assertion A** and the other is labelled as **Reason R** **Assertion A** :…EasyAssertion–reason
  2. 4 Sep 2020, Shift 2 · Q35The incorrect statement(s) among (a) - (c) is (are) : (a) W(VI) is more stable than Cr(VI). (b) in the presence of HCl, permanganate…MediumOther

Shifts: 4 Sep 2020, Shift 2, 28 Jul 2022, Shift 2.

Same topic

Other ideas in d-Block Elements

d-Block Elements has 31 ideas JEE Main has asked; 21 of them came up in more than one question. The 12 most asked are below.

Topic analysisChapter analysisStudy this chapterAll repeated ideas