Learn

Saturday, 31 October

JEE Main · Chemistry · Surface Chemistry

Hardy-Schulze Rule

JEE Main asked Hardy-Schulze Rule 5 times in 5 of the 108 shifts Lumi analysed, in 2020, 2021 and 2023. It belongs to Colloids, in Surface Chemistry (Chemistry). The longest wait between two years asking it was 2 years. In 2021 and 2023 it came in more than one shift of the same year.

Updated 2026-10-24

Times asked
5
in 5 shifts
Years
3 of 8
First asked
2020
last in 2023
Pattern
Comes in cycles
across the analysed shifts

Questions on this idea a shift, by year

2017–2026. Asked in 2020, 2021 and 2023. Years differ in how many shifts Lumi analysed, so each year is scaled to one shift of 25 Chemistry questions.

00.10.20’170.08’200.07’210’220.14’230’240’250’26

Raw count: 2017: 0 in 1 shift · 2020: 1 in 12 shifts · 2021: 2 in 24 shifts · 2022: 0 in 24 shifts · 2023: 2 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
  • 20232 of 12
  • 20220 of 24
  • 20212 of 24
  • 20201 of 12
  • 20170 of 1

Asked in that shift More than once Not asked

How JEE Main framed it

Single correct is the usual form. Skill tested: application.

  • Order/ranking of flocculation values
  • Coagulation of blood by ferric ions

Difficulty

Easy 4Medium 1Hard 0

1 of the 5 questions had a numerical answer.

Every question

All 5 questions

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

  1. 15 Apr 2023, Shift 1 · Q8620 mL of 0.5 M NaCl is required to coagulate 200 mL of As2S3\mathrm{As_2S_3} solution in 2 hours. The coagulating value of NaCl is __________.EasyNumerical value
  2. 10 Apr 2023, Shift 2 · Q63Ferric chloride is applied to stop bleeding because -EasySingle correct
  3. 17 Mar 2021, Shift 2 · Q33For the coagulation of a negative sol, the species below, that has the highest flocculating power is :EasySingle correct
  4. 24 Feb 2021, Shift 2 · Q33Most suitable salt which can be used for efficient clotting of blood will be :EasySingle correct
  5. 8 Jan 2020, Shift 1 · Q28As per Hardy-Schulze formulation, the flocculation values of the following for ferric hydroxide sol are in the order :MediumSingle correct

Shifts: 8 Jan 2020, Shift 1, 24 Feb 2021, Shift 2, 17 Mar 2021, Shift 2, 10 Apr 2023, Shift 2, 15 Apr 2023, Shift 1.

Same topic

Other ideas in Colloids

Colloids has 16 ideas JEE Main has asked; 7 of them came up in more than one question. The 12 most asked are below.

Topic analysisChapter analysisAll repeated ideas