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  4. Which of the following substances has the highest melting point?

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Q. Which of the following substances has the highest melting point?

Uttarkhand PMTUttarkhand PMT 2007

Solution:

Melting points, among other things, depend upon lattice energy.
Now $NaCl$ and $KCl$ have unit charge on their ions while $M g O$ and $B a O$ have two units of charge,
therefore, lattice energies of $M g O$ and $B a O$ are expected to be larger than those of $NaCl$ and $KCl$.
Further since $M g^{2+}$ is smaller than $B a^{2+}$,
therefore, $M g O$ has the highest lattice energy and hence has the highest melting point.