Hydration solution |ThermodynamiThermochemistryJEEMAIN2025

JEE MAIN 2025

07.04.25 S2

Question

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

Select the correct option:

$z-(x+y)$

$x+y+z$

$-z-(x+y)$

$+x-y-z$

✓ Correct! Well done.

✗ Incorrect. Try again or view the solution.

Solution

Sol.

$$ \begin{aligned} & \Delta \mathrm{H}_{\mathrm{Sol}^{-} .}=\mathrm{L} \cdot \mathrm{E} \cdot+(\mathrm{H} \cdot \mathrm{E})_{\mathrm{K}_{(\mathrm{s})}^{+}}+(\mathrm{HE})_{\mathrm{Cl}_{(\mathrm{s})}^{-1}} \\ & =\mathrm{Z}-\mathrm{x}-\mathrm{y} \\ & =\mathrm{z}-(\mathrm{x}+\mathrm{y}) \end{aligned} $$

Question Tags

JEE Main

Chemistry

Easy

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