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JEE Main 20257 AprilEvening Shift
Exam
JEE Main
Year
2025
Date
7 April
Shift
Evening Shift
Subject
Chemistry
Chapter
Thermodynamics (C)

JEE Main 2025 · 7 April · Evening Shift · Chemistry · Thermodynamics (C)

The hydration energies of K^ + and Cl^ - are -x and -y kJ / mol...

The hydration energies of K+\mathrm{K}^{+}and Cl−\mathrm{Cl}^{-}are -x and -y kJ/mol\mathrm{kJ} / \mathrm{mol} respectively. If lattice energy of KCl is -z kJ/mol\mathrm{kJ} / \mathrm{mol}, then the heat of solution of KCl is :

Options

  1. A+x−y−z+x-y-z
  2. Bx+y+zx+y+z
  3. Cz−(x+y)z-(x+y)
  4. D−z−(x+y)-\mathrm{z}-(\mathrm{x}+\mathrm{y})

Correct answer

C. z−(x+y)z-(x+y)

Step-by-step solution

ΔHSoln.=L⋅E⋅+(H⋅E)K(g)++(HE)Cl(g)−1=Z−x−y=z−(x+y)\begin{aligned} \Delta \mathrm{H}_{\text{Sol}^{\mathrm{n}}.} & =\mathrm{L} \cdot \mathrm{E} \cdot+(\mathrm{H} \cdot \mathrm{E})_{\mathrm{K}_{(\mathrm{g})}^{+}}+(\mathrm{HE})_{\mathrm{Cl}_{(\mathrm{g})}^{-1}} \\ & =\mathrm{Z}-\mathrm{x}-\mathrm{y} \\ & =\mathrm{z}-(\mathrm{x}+\mathrm{y})\end{aligned}
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