JEE Main · Chemistry · Hydrogen
Temporary Hardness and Clark's Method
JEE Main asked Temporary Hardness and Clark's Method 3 times in 3 of the 108 shifts Lumi analysed, in 2021 and 2022. It belongs to Hydrogen and Hydrides, in Hydrogen (Chemistry). The longest wait between two years asking it was 1 year. In 2022 it came in more than one shift of the same year.
Updated 2026-10-24
- Times asked
- 3
- in 3 shifts
- Years
- 2 of 8
- First asked
- 2021
- last in 2022
- Pattern
- Occasional
- across the analysed shifts
Questions on this idea a shift, by year
2017–2026. Asked in 2021 and 2022. Years differ in how many shifts Lumi analysed, so each year is scaled to one shift of 25 Chemistry questions.
Raw count: 2017: 0 in 1 shift · 2020: 0 in 12 shifts · 2021: 1 in 24 shifts · 2022: 2 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.
How JEE Main framed it
Single correct is the usual form. Skill tested: recall.
- Assertion-reason on water hardness
- Products of hard water treatment
Difficulty
Every question was multiple choice.
Every question
All 3 questions
From the official JEE Main shift papers, newest first. Open one for the full question, the options and the official answer.
- 26 Jun 2022, Shift 2 · Q65Boiling of hard water is helpful in removing the temporary hardness by converting calcium hydrogen carbonate and magnesium hydrogen…EasySingle correct
- 28 Jul 2022, Shift 2 · Q34The products obtained during treatment of hard water using Clark's method are :EasySingle correct
- 18 Mar 2021, Shift 1 · Q36Given below are two Statements : One is labelled as Assertion A and the other is labelled as Reason R : Assertion A : During the boiling…MediumAssertion–reason
Shifts: 18 Mar 2021, Shift 1, 26 Jun 2022, Shift 2, 28 Jul 2022, Shift 2.
Same topic
Other ideas in Hydrogen and Hydrides
Hydrogen and Hydrides has 29 ideas JEE Main has asked; 21 of them came up in more than one question. The 12 most asked are below.
- Isotopes of Hydrogen5× · 2023
- Syngas Production via Reforming4× · 2023
- Redox Behavior of Hydrogen Peroxide4× · 2022
- Ion-Exchange Resins for Water Softening3× · 2023
- Water-Gas Shift Reaction3× · 2023
- Oxidizing Action of H2O23× · 2022
- H-H Bond Dissociation Enthalpy3× · 2021
- Covalent Hydride Types2× · 2023
- Dihydrogen from Brine Electrolysis2× · 2023
- Kinetic Isotope Effect in Hydrogen2× · 2023
- Storage and Stabilization of H2O22× · 2023
- Causes of Temporary and Permanent Hardness2× · 2022