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JEE Main 2025 · ChemistryMultiple choiceSingle correctEasyConceptual

JEE Main 7 April 2025, Shift 2, Chemistry Q53

Question 53 of 75 in this shift, Chemistry question 3 of 25, Section A.

The hydration energies of

\mathrm{K^+}

and

\mathrm{Cl^-}

are

-x

and

-y

kJ/mol respectively. If lattice energy of KCl is

-z

kJ/mol, then the heat of solution of KCl is :

(1) $x+y+z$
(2) $+x-y-z$
(3) $-z-(x+y)$
(4) $z-(x+y)$ Official answer

Official answer

Option 4

NTA final key.

Chapter: Solutions
Topic: Enthalpy and Hess's Law
Idea tested: Enthalpy of Solution and Hydration

Same idea in other shifts

Asked 2× in all

9 Apr 2024, Shift 1 · Q83The heat of solution of anhydrous $\mathrm{CuSO_4}$ and $\mathrm{CuSO_4\cdot5H_2O}$ are $-70$ kJ mol $^{-1}$ and $+12$ kJ mol $^{-1}$ …EasyNumerical value

Question text from the official JEE Main paper published by NTA; answer from the final answer key. Chapter, topic and idea tags, difficulty and skill are Lumi’s. Lumi analyses 42 of the 174 JEE Main shifts held from 2017 to 2026.