Learn

Saturday, 31 October

JEE Main · Chemistry · Coordination Compounds

Classification of Hydrates

JEE Main asked Classification of Hydrates 2 times in 2 of the 108 shifts Lumi analysed, in 2021 and 2022. It belongs to Hydrogen and Hydrides, in Coordination Compounds (Chemistry). The longest wait between two years asking it was 1 year.

Updated 2026-10-24

Times asked
2
in 2 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.

00.050.10’170’200.03’210.03’220’230’240’250’26

Raw count: 2017: 0 in 1 shift · 2020: 0 in 12 shifts · 2021: 1 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
  • 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: conceptual.

  • Statement i/ii on bonding in copper sulphate pentahydrate
  • Count water molecules of given type in hydrate

Difficulty

Easy 0Medium 2Hard 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. 29 Jun 2022, Shift 2 · Q68Given below are two statements. • Statement I: In CuSO4⋅5H2O\mathrm{CuSO_4{\cdot}5H_2O}, Cu-O bonds are present. • Statement II: In…MediumTwo statements
  2. 31 Aug 2021, Shift 1 · Q58The number of hydrogen bonded water molecule(s) associated with stoichiometry CuSO4⋅5H2O\mathrm{CuSO_4\cdot 5H_2O} is __________.MediumNumerical value

Shifts: 31 Aug 2021, Shift 1, 29 Jun 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.

Topic analysisChapter analysisStudy this chapterAll repeated ideas