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Saturday, 31 October

JEE Main · Chemistry · Solutions

Enthalpy of Solution and Hydration

JEE Main asked Enthalpy of Solution and Hydration 2 times in 2 of the 108 shifts Lumi analysed, in 2024 and 2025. It belongs to Enthalpy and Hess's Law, in Solutions (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
2024
last in 2025
Pattern
New since 2024
across the analysed shifts

Questions on this idea a shift, by year

2017–2026. Asked in 2024 and 2025. Years differ in how many shifts Lumi analysed, so each year is scaled to one shift of 25 Chemistry questions.

00.10.20’170’200’210’220’230.05’240.13’250’26

Raw count: 2017: 0 in 1 shift · 2020: 0 in 12 shifts · 2021: 0 in 24 shifts · 2022: 0 in 24 shifts · 2023: 0 in 12 shifts · 2024: 1 in 18 shifts · 2025: 1 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
  • 20251 of 8
  • 20241 of 18
  • 20230 of 12
  • 20220 of 24
  • 20210 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.

  • Heat of solution from lattice and hydration energies
  • Heat of hydration from heats of solution

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. 7 Apr 2025, Shift 2 · Q53The hydration energies of K+\mathrm{K^+} and Cl−\mathrm{Cl^-} are −x-x and −y-y kJ/mol respectively. If lattice energy of KCl is −z-z…EasySingle correct
  2. 9 Apr 2024, Shift 1 · Q83The heat of solution of anhydrous CuSO4\mathrm{CuSO_4} and CuSO4⋅5H2O\mathrm{CuSO_4\cdot5H_2O} are −70-70 kJ mol−1^{-1} and +12+12 kJ mol−1^{-1}…EasyNumerical value

Shifts: 9 Apr 2024, Shift 1, 7 Apr 2025, Shift 2.

Same topic

Other ideas in Enthalpy and Hess's Law

Enthalpy and Hess's Law has 23 ideas JEE Main has asked; 12 of them came up in more than one question. The 12 most asked are below.

Topic analysisChapter analysisStudy this chapterAll repeated ideas