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  4. Which pair is not correct order of lattice energy?

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Q. Which pair is not correct order of lattice energy?

Chemical Bonding and Molecular Structure

Solution:

Larger the charge on cation and anion, larger the polarising power and thus larger the covalent nature and such compounds have larger lattice energy.

$\begin{matrix}K^{+}>Mg^{2+}&Size&Cl^{-}>O^{2-}&Size\\ +1 \,\,\,+2&charge&-1 <2-&charge\end{matrix}$

Thus, $MgO$ is less ionic than $KCl$ thus lattice energy of $MgO$ is larger than that of $KCl$.

Thus, given order is incorrect.